Remove obsolete float comparison FIXMEs

Remove obsolete float comparison FIXMEs
https://bugs.webkit.org/show_bug.cgi?id=79127

Reviewed by Eric Seidel.

Remove obsolete FIXME comments added back when we were planning to use
floating point units for layout.

No new tests, no code changes.

* page/FrameView.cpp:
(WebCore::FrameView::init):
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::layoutBlock):
(WebCore::RenderBlock::computeStartPositionDeltaForChildAvoidingFloats):
(WebCore::RenderBlock::getClearDelta):
* rendering/RenderBox.cpp:
(WebCore::RenderBox::computeLogicalHeight):
(WebCore::RenderBox::computeLogicalHeightUsing):
(WebCore::RenderBox::computePercentageLogicalHeight):
* rendering/RenderBoxModelObject.cpp:
(WebCore::ImageQualityController::shouldPaintAtLowQuality):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108377 268f45cc-cd09-0410-ab3c-d52691b4dbfc