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CastRunner::OnComponentDestroyed() wasn't handling the case when
video_capturer_component_ is destroyed. As result
video_capturer_component_ would point to a deleted object. CastRunner
was crashing when trying to use the invalid video_capture_component_ in
OnCameraServiceRequest().

Bug: crbug.com/1122150
Change-Id: I79c8f10cc5964bf9f7ea81e7a026f5276e3d14e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377898Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806056}