Revert of Use enclosingLayoutRect instead of enclosingIntRect in SVGLayoutSupport::transformPaintInvalidation…

Revert of Use enclosingLayoutRect instead of enclosingIntRect in SVGLayoutSupport::transformPaintInvalidation… (patchset #9 id:160001 of https://codereview.chromium.org/2380403002/ )

Reason for revert:
The CL might be incorrect. See https://bugs.chromium.org/p/chromium/issues/detail?id=651521#c7 for details.

Original issue's description:
> Use enclosingLayoutRect instead of enclosingIntRect in SVGLayoutSupport::transformPaintInvalidationRect()
> 
> https://bugs.chromium.org/p/chromium/issues/detail?id=651521#c2:
> The purpose of the original enclosingIntRect() might be to avoid
> unwanted inward-snapping due to FloatRect -> LayoutRect conversion.
> 
> Change it to enclosingLayoutRect. Also changed PaintInvalidator to
> use enclosingLayoutRect when converting from FloatRect to
> LayoutRect.
> 
> BUG=651521
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/97024f931ff54c93b9b0633c3406b4f9ff9779b7
> Cr-Commit-Position: refs/heads/master@{#422710}

TBR=fs@opera.com,pdr@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=651521

[Xianzhu, 2016-10-12 16:57:57]

Created Revert of Use enclosingLayoutRect instead of enclosingIntRect in
SVGLayoutSupport::transformPaintInvalidation…