Don't convert IntRect -> FloatRect -> IntRect.

If EnclosingIntRect() is called on an IntRect it is first
converted to a FloatRect or DoubleRect since that is what
EnclosingIntRect() is used for. Then you (hopefully) get
the originally IntRect back.

This strange conversion wasn't obvious in the code because the
type of the IntRect was hidden by an |auto|. It was discovered in
jumbo builds because the compiler had access to both DoubleRect
and FloatRect and didn't know which one to use.

Bug: 843606
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1ca799cc27da02e1c6615bf403bc190fec1d5cde
Reviewed-on: https://chromium-review.googlesource.com/1122219
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#571887}
1 file changed