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This CL fixes a race condition in which a MediaLog could be created in
a context that is already destroyed. See the attached bug for more
details.

Bug: 1154468
Change-Id: I26ae0c621d9a4557d224ca77f696ad3ce53b41c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580478Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835842}