Reviewed by Darin Adler.

        Remove the remaining editing-style functions from ApplyStyleCommand
        https://bugs.webkit.org/show_bug.cgi?id=49155

        Replaced removeNonEditingProperties, editingStyleAtPosition, prepareEditingStyleToApplyAt,
        and removeStylesAddedByNode in ApplyStyleCommand.cpp by removeNonEditingProperties, EditingStyle::create,
        prepareToApplyAt, and removeStyleAddedByNode in EditingStyle.cpp.

        Also removed unnecessary header includes from various cpp files.

        No tests are added since this is a cleanup.

        * editing/ApplyStyleCommand.cpp: Removed removeNonEditingProperties, editingStyleAtPosition,
        prepareEditingStyleToApplyAt, and removeStylesAddedByNode.
        * editing/ApplyStyleCommand.h: Ditto.
        * editing/DeleteSelectionCommand.cpp: Removed removeEnclosingAnchorStyle.
        (WebCore::DeleteSelectionCommand::saveTypingStyleState): Calls removeStylesAddedByNode instead.
        * editing/EditingStyle.cpp:
        (WebCore::copyEditingProperties): Moved and renamed ApplyStyleCommand::removeNonEditingProperties.
        (WebCore::editingStyleFromComputedStyle): Calls copyEditingProperties. Changed the argument to PassRefPtr
        as supposed to a raw pointer for convenience.
        (WebCore::EditingStyle::init): Calls editingStyleFromComputedStyle.
        (WebCore::EditingStyle::removeStyleAddedByNode): Added.
        (WebCore::EditingStyle::removeStyleConflictingWithStyleOfNode): Added.
        (WebCore::EditingStyle::removeNonEditingProperties): Added.
        (WebCore::editingStyleIncludingTypingStyle): Calls copyEditingProperties.
        * editing/EditingStyle.h: Added prototypes.
        * editing/Editor.cpp:
        (WebCore::Editor::selectionComputedStyle): Uses EditingStyle.
        * editing/InsertParagraphSeparatorCommand.cpp:
        (WebCore::InsertParagraphSeparatorCommand::calculateStyleBeforeInsertion): Ditto.
        (WebCore::InsertParagraphSeparatorCommand::applyStyleAfterInsertion): Ditto.
        * editing/InsertParagraphSeparatorCommand.h:
        * editing/RemoveFormatCommand.cpp:
        (WebCore::RemoveFormatCommand::doApply): Ditto.
        * editing/ReplaceSelectionCommand.cpp:
        (WebCore::handleStyleSpansBeforeInsertion): Ditto.
        (WebCore::ReplaceSelectionCommand::handleStyleSpans): Ditto.
        (WebCore::ReplaceSelectionCommand::doApply): Ditto.
        (WebCore::ReplaceSelectionCommand::completeHTMLReplacement): Ditto.
        * editing/ReplaceSelectionCommand.h:
        * editing/markup.cpp: Removed removeEnclosingMailBlockquoteStyle and removeDefaultStyles.
        (WebCore::createMarkup): Uses EditingStyle.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71556 268f45cc-cd09-0410-ab3c-d52691b4dbfc