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DecoderSelector provides an InitCB that destroys the VideoDecoder
immeidately when initialization fails. This means that |this| is
invalidated immedately upon calling |init_cb_| in MojoVideoDecoder.

This CL adds a WeakPtr-based test for |this| destruction to the
potentially problematic callbacks in MojoVideoDecoder::Stop().

Bug: 839881
Change-Id: I9b1302ad3007a834c95ed1d3845e24b0d07158f8
Reviewed-on: https://chromium-review.googlesource.com/1169907Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581954}