Valgrind: Suppress more layout test errors.
Valgrind: Suppress more layout test errors.

Also widen an existing layout test error.

BUG=492821,521656,542875

Review URL: https://codereview.chromium.org/1391743005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#353886}

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