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Currently the GpuVideoAcceleratorFactoriesImpl will check for context
loss every time it tries to use the GL context, and destroy it
immediately if it sees a loss. This is problematic if the
ContextProvider is still on the callstack, which it is if we're inside
the context loss callback. Instead, leave the ContextProvider alive
until the GpuVideoAcceleratorFactoriesImpl stops being used.

R=liberato@chromium.org

Bug: 849131
Change-Id: I8ec66671b4bbf5d426cb5fb184653a5863de9fd9
Reviewed-on: https://chromium-review.googlesource.com/1104777
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568256}