Guard call to assertSubtreeClearedPaintInvalidationState correctly.
Guard call to assertSubtreeClearedPaintInvalidationState correctly.

The definition of assertSubtreeClearedPaintInvalidationState is guarded
with ENABLE(ASSERT).

R=dcheng@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/747433003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185691 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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