Finish making FloatingObject a real class with private members

Finish making FloatingObject a real class with private members
https://bugs.webkit.org/show_bug.cgi?id=119807

This is a port from Blink of
http://src.chromium.org/viewvc/blink?view=revision&revision=155964
Original patch by Eric Seidel.

From his comments on the Blink change:

Previously FloatingObject was in a half-done state where it had
accessors for many members, but also many members were public.

This CL makes all members private and adds the necessary remaining
accessors.

Reviewed by David Hyatt.

No new tests, no behavior change.

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::deleteLineBoxTree):
(WebCore::RenderBlock::addOverflowFromFloats):
(WebCore::RenderBlock::repaintOverhangingFloats):
(WebCore::RenderBlock::paintFloats):
(WebCore::RenderBlock::selectionGaps):
(WebCore::RenderBlock::insertFloatingObject):
(WebCore::RenderBlock::removeFloatingObject):
(WebCore::RenderBlock::removeFloatingObjectsBelow):
(WebCore::RenderBlock::positionNewFloats):
(WebCore::RenderBlock::clearFloats):
(WebCore::RenderBlock::addOverhangingFloats):
(WebCore::RenderBlock::addIntrudingFloats):
(WebCore::RenderBlock::hitTestFloats):
(WebCore::RenderBlock::adjustForBorderFit):
* rendering/RenderBlock.h:
(WebCore::RenderBlock::FloatingObject::paginationStrut):
(WebCore::RenderBlock::FloatingObject::setPaginationStrut):
(WebCore::RenderBlock::FloatingObject::setRenderer):
(WebCore::RenderBlock::FloatingObject::originatingLine):
(WebCore::RenderBlock::FloatingObject::setOriginatingLine):
(WebCore::RenderBlock::FloatingObjectHashFunctions::hash):
(WebCore::RenderBlock::FloatingObjectHashFunctions::equal):
(WebCore::RenderBlock::FloatingObjectHashTranslator::equal):
* rendering/RenderBlockLineLayout.cpp:
(WebCore::RenderBlock::appendFloatingObjectToLastLine):
(WebCore::RenderBlock::layoutRunsAndFloatsInRange):
(WebCore::RenderBlock::linkToEndLineIfNeeded):
(WebCore::RenderBlock::determineStartPosition):
(WebCore::RenderBlock::positionNewFloatOnLine):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@154069 268f45cc-cd09-0410-ab3c-d52691b4dbfc