Revert linesBoundingBox to integers

Revert linesBoundingBox to integers
https://bugs.webkit.org/show_bug.cgi?id=82182

Reviewed by Eric Seidel.

LayoutRects are intended to be pixel snapped to determine the ultimate screen
coordinates, but the Inline Box tree is laid out using floats, and pixel snapping
the resulting box from linesBoundingBox would produce a potentially incorrect
rectangle. Keeping this using enclosingIntRect retains the previous accuracy and
prevents misuse.

No new tests. No change in behavior.

* rendering/RenderInline.cpp:
(WebCore::RenderInline::linesBoundingBox):
* rendering/RenderInline.h:
(RenderInline):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::updateLayerPosition):
* rendering/RenderText.cpp:
(WebCore::RenderText::linesBoundingBox):
* rendering/svg/RenderSVGInlineText.cpp:
(WebCore::RenderSVGInlineText::linesBoundingBox):
* rendering/svg/RenderSVGInlineText.h:
(RenderSVGInlineText):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@112237 268f45cc-cd09-0410-ab3c-d52691b4dbfc