Don't use fallback frame sinks on Android

Software rendering doesn't work on Android. Just crash the renderer
if it fails to initialize a CompositorFrameSink after 4 retries instead
of falling back to software.

BUG=721102

Review-Url: https://codereview.chromium.org/2872353005
Cr-Commit-Position: refs/heads/master@{#471454}
5 files changed