noahric 0dacbf5f62 Create a null decoder for h264 when not supported, instead of crashing.
BUG=
NOTRY=true

Review-Url: https://codereview.webrtc.org/2091923002
Cr-Commit-Position: refs/heads/master@{#13311}
2016-06-28 13:39:52 +00:00
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