remove dead code in flipForWritingMode

remove dead code in flipForWritingMode
https://bugs.webkit.org/show_bug.cgi?id=68948

Reviewed by Hajime Morita.

ChildToParentFlippingAdjustment is never used, so the third argument
to flipForWritingMode always has the same value.

In addition, renamed to flipForWritingModeForChild to be more clear
that it's operating on the child and renamed flipFloatForWritingMode to match.

No new tests. This is just a code cleanup. No functional changes.

* rendering/InlineBox.cpp:
(WebCore::InlineBox::paint):
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::paintChildren):
(WebCore::RenderBlock::flipFloatForWritingModeForChild):
(WebCore::RenderBlock::paintFloats):
(WebCore::RenderBlock::hitTestFloats):
(WebCore::RenderBlock::hitTestContents):
* rendering/RenderBlock.h:
* rendering/RenderBox.cpp:
(WebCore::RenderBox::flipForWritingModeForChild):
(WebCore::RenderBox::topLeftLocation):
* rendering/RenderBox.h:
* rendering/RenderTable.cpp:
(WebCore::RenderTable::paintObject):
(WebCore::RenderTable::nodeAtPoint):
* rendering/RenderTableRow.cpp:
(WebCore::RenderTableRow::nodeAtPoint):
* rendering/RenderTableSection.cpp:
(WebCore::RenderTableSection::paintCell):
(WebCore::RenderTableSection::nodeAtPoint):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96546 268f45cc-cd09-0410-ab3c-d52691b4dbfc