bindings: Add assersion in v8AtomicString
bindings: Add assersion in v8AtomicString

We should crash renderers when NewFromUtf8() fails because such failures
are critical.

Review URL: https://codereview.chromium.org/1032053003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192516 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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