Merge 132904 - [subixel] Change LineWidth::shrinkAvailableWidthForNewFloatIfNeeded to not pixel snap

Merge 132904 - [subixel] Change LineWidth::shrinkAvailableWidthForNewFloatIfNeeded to not pixel snap
https://bugs.webkit.org/show_bug.cgi?id=100742

Reviewed by Levi Weintraub.

Source/WebCore:

As we no longer pixel snap values when computing the current width for a
line we should not do it in shrinkAvailableWidthForNewFloatIfNeeded
either.

Test: fast/sub-pixel/float-wrap-zoom.html

* rendering/RenderBlockLineLayout.cpp:
(WebCore::LineWidth::LineWidth): Remove unnecessary ifdef.
(WebCore::LineWidth::shrinkAvailableWidthForNewFloatIfNeeded): Use float values instead of pixel snapped/floored values as the line width calculations uses floats.

LayoutTests:

Add test for wrapping when combining float and inline elements.

* fast/sub-pixel/float-wrap-zoom-expected.html: Added.
* fast/sub-pixel/float-wrap-zoom.html: Added.


TBR=eae@chromium.org