Internals methods return 0 instead of false when they fail
Internals methods return 0 instead of false when they fail

Some Internals method explicitly return 0 although they expect
boolean value.

BUG=

Review URL: https://codereview.chromium.org/884763003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189813 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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