Reviewed by Darin Adler.

        https://bugs.webkit.org/show_bug.cgi?id=24491
        Rename posOffset to m_offset, get rid of accessor

        As suggested in dom/Position.h, this patch gets rid of the
        'offset()' accessor and renames posOffset to m_offset. I've used
        m_offset instead of offset to follow the style guide lines, since
        Position is still a class and not a structure. If the long term
        plan is still to make it a structure it would be pretty easy to
        just s/m_offset/offset/ globally when that is achieved.

        * dom/Position.cpp:
        (WebCore::Position::previous):
        (WebCore::Position::next):
        (WebCore::Position::atStart):
        (WebCore::Position::atEnd):
        (WebCore::Position::renderedOffset):
        (WebCore::Position::isCandidate):
        (WebCore::Position::inRenderedText):
        (WebCore::Position::isRenderedCharacter):
        (WebCore::Position::rendersInDifferentPosition):
        (WebCore::Position::leadingWhitespacePosition):
        (WebCore::Position::debugPosition):
        (WebCore::Position::formatForDebugger):
        * dom/Position.h:
        (WebCore::Position::Position):
        * dom/PositionIterator.h:
        (WebCore::PositionIterator::PositionIterator):
        * dom/Range.cpp:
        * dom/RangeBoundaryPoint.h:
        (WebCore::RangeBoundaryPoint::position):
        (WebCore::RangeBoundaryPoint::set):
        (WebCore::RangeBoundaryPoint::setOffset):
        (WebCore::RangeBoundaryPoint::setToChild):
        (WebCore::RangeBoundaryPoint::setToStart):
        (WebCore::RangeBoundaryPoint::setToEnd):
        (WebCore::RangeBoundaryPoint::childBeforeWillBeRemoved):
        * editing/ApplyStyleCommand.cpp:
        (WebCore::ApplyStyleCommand::applyRelativeFontStyleChange):
        (WebCore::ApplyStyleCommand::applyInlineStyleToRange):
        (WebCore::ApplyStyleCommand::removeInlineStyle):
        (WebCore::ApplyStyleCommand::nodeFullySelected):
        (WebCore::ApplyStyleCommand::nodeFullyUnselected):
        (WebCore::ApplyStyleCommand::splitTextAtStartIfNeeded):
        (WebCore::ApplyStyleCommand::splitTextAtEndIfNeeded):
        (WebCore::ApplyStyleCommand::splitTextElementAtStartIfNeeded):
        (WebCore::ApplyStyleCommand::splitTextElementAtEndIfNeeded):
        (WebCore::ApplyStyleCommand::mergeStartWithPreviousIfIdentical):
        (WebCore::ApplyStyleCommand::mergeEndWithNextIfIdentical):
        (WebCore::ApplyStyleCommand::joinChildTextNodes):
        * editing/BreakBlockquoteCommand.cpp:
        (WebCore::BreakBlockquoteCommand::doApply):
        * editing/CompositeEditCommand.cpp:
        (WebCore::CompositeEditCommand::insertNodeAt):
        (WebCore::CompositeEditCommand::positionOutsideTabSpan):
        (WebCore::CompositeEditCommand::rebalanceWhitespaceAt):
        (WebCore::CompositeEditCommand::prepareWhitespaceAtPositionForSplit):
        (WebCore::CompositeEditCommand::deleteInsignificantText):
        (WebCore::CompositeEditCommand::removePlaceholderAt):
        (WebCore::CompositeEditCommand::moveParagraphs):
        (WebCore::CompositeEditCommand::breakOutOfEmptyMailBlockquotedParagraph):
        * editing/DeleteSelectionCommand.cpp:
        (WebCore::updatePositionForNodeRemoval):
        (WebCore::updatePositionForTextRemoval):
        (WebCore::DeleteSelectionCommand::handleGeneralDelete):
        (WebCore::DeleteSelectionCommand::fixupWhitespace):
        * editing/Editor.cpp:
        (WebCore::Editor::setComposition):
        (WebCore::Editor::advanceToNextMisspelling):
        (WebCore::Editor::getCompositionSelection):
        * editing/InsertLineBreakCommand.cpp:
        (WebCore::InsertLineBreakCommand::doApply):
        * editing/InsertParagraphSeparatorCommand.cpp:
        (WebCore::InsertParagraphSeparatorCommand::doApply):
        * editing/InsertTextCommand.cpp:
        (WebCore::InsertTextCommand::performTrivialReplace):
        (WebCore::InsertTextCommand::input):
        (WebCore::InsertTextCommand::insertTab):
        * editing/MoveSelectionCommand.cpp:
        (WebCore::MoveSelectionCommand::doApply):
        * editing/ReplaceSelectionCommand.cpp:
        (WebCore::ReplaceSelectionCommand::doApply):
        * editing/SelectionController.cpp:
        (WebCore::SelectionController::debugRenderer):
        * editing/TextIterator.cpp:
        (WebCore::TextIterator::rangeFromLocationAndLength):
        * editing/TypingCommand.cpp:
        (WebCore::TypingCommand::deleteKeyPressed):
        (WebCore::TypingCommand::forwardDeleteKeyPressed):
        * editing/VisiblePosition.cpp:
        (WebCore::VisiblePosition::characterAfter):
        (WebCore::VisiblePosition::debugPosition):
        (WebCore::makeRange):
        (WebCore::setStart):
        (WebCore::setEnd):
        * editing/VisibleSelection.cpp:
        (WebCore::VisibleSelection::toNormalizedRange):
        (WebCore::makeSearchRange):
        (WebCore::VisibleSelection::debugPosition):
        (WebCore::VisibleSelection::showTreeForThis):
        * editing/htmlediting.cpp:
        (WebCore::comparePositions):
        (WebCore::rangeCompliantEquivalent):
        (WebCore::isFirstPositionAfterTable):
        (WebCore::isLastPositionBeforeTable):
        * editing/visible_units.cpp:
        (WebCore::previousBoundary):
        (WebCore::nextBoundary):
        (WebCore::startPositionForLine):
        (WebCore::startOfLine):
        (WebCore::endPositionForLine):
        (WebCore::nextLinePosition):
        (WebCore::startOfParagraph):
        (WebCore::endOfParagraph):
        * page/AccessibilityObject.cpp:
        (WebCore::updateAXLineStartForVisiblePosition):
        * page/AccessibilityRenderObject.cpp:
        (WebCore::AccessibilityRenderObject::indexForVisiblePosition):
        * page/DOMSelection.cpp:
        (WebCore::DOMSelection::anchorOffset):
        (WebCore::DOMSelection::baseOffset):
        (WebCore::DOMSelection::focusOffset):
        (WebCore::DOMSelection::extentOffset):
        * page/EventHandler.cpp:
        (WebCore::EventHandler::handleMousePressEventSingleClick):
        * page/Frame.cpp:
        (WebCore::Frame::selectionLayoutChanged):
        * rendering/RenderTextControl.cpp:
        (WebCore::RenderTextControl::indexForVisiblePosition):
        * rendering/RenderTreeAsText.cpp:
        (WebCore::writeSelection):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41553 268f45cc-cd09-0410-ab3c-d52691b4dbfc