Temporarily disable baseLayoutStyle optimization.
Temporarily disable baseLayoutStyle optimization.

In order to figure out more about how the baseRenderStyle validity assert
triggers in the wild, we'll try to temporarily make a RELEASE_ASSERT out
of it.

This means we'll effectively disable the optimization, yet clone a
baseLayoutStyle to be able to check that the optimization would have been
sound.

Performance tests may intentionally degrade as a consequence.

R=esprehn@chromium.org
BUG=463413

Review URL: https://codereview.chromium.org/1001323003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192378 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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