Render tree memory savings, part 1
        
        - Eliminate caching of monospace char width from RenderText. This optimization is not needed
          anymore since Font already caches space width (RenderText -4 bytes)
        - Eliminate caching of tab width from RenderBlock. Similary this optimization has become
          obsolete (RenderBlock -4 bytes)

        * platform/Font.cpp:
        (WebCore::WidthIterator::advance):
        (WebCore::Font::spaceWidth):
        * platform/Font.h:
        (WebCore::Font::tabWidth):
        * platform/TextStyle.h:
        (WebCore::TextStyle::TextStyle):
        (WebCore::TextStyle::allowTabs):
        * rendering/InlineTextBox.cpp:
        (WebCore::InlineTextBox::selectionRect):
        (WebCore::InlineTextBox::paint):
        (WebCore::InlineTextBox::paintSelection):
        (WebCore::InlineTextBox::paintMarkedTextBackground):
        (WebCore::InlineTextBox::paintSpellingOrGrammarMarker):
        (WebCore::InlineTextBox::paintTextMatchMarker):
        (WebCore::InlineTextBox::offsetForPosition):
        (WebCore::InlineTextBox::positionForOffset):
        * rendering/RenderBlock.cpp:
        (WebCore:::RenderFlow):
        (WebCore::RenderBlock::setStyle):
        * rendering/RenderBlock.h:
        * rendering/RenderObject.cpp:
        * rendering/RenderObject.h:
        * rendering/RenderText.cpp:
        (WebCore::RenderText::RenderText):
        (WebCore::RenderText::setStyle):
        (WebCore::RenderText::widthFromCache):
        (WebCore::RenderText::trimmedMinMaxWidth):
        (WebCore::RenderText::calcMinMaxWidthInternal):
        (WebCore::RenderText::setTextInternal):
        (WebCore::RenderText::width):
        * rendering/RenderText.h:
        (WebCore::RenderText::allowTabs):
        * rendering/bidi.cpp:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20610 268f45cc-cd09-0410-ab3c-d52691b4dbfc