Get rid of hack in invalidatePaintUsingContainer for partially computed squashing layer state. This is no longer necessary after crrev.com/311813005.
Get rid of hack in invalidatePaintUsingContainer for partially computed
squashing layer state. This is no longer necessary after crrev.com/311813005.

BUG=

Review URL: https://codereview.chromium.org/331563005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@176138 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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