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WebrtcVideoStream::OnFrameEncoded() expects that the |frame| parameter
might be null, but it tries to use it anyway. This CL adds a
null check before the dereference, preventing a host process crash.

Bug: 1049804
Change-Id: I3e02b7c5bced24611f2ba6a22025ff7ba173bd69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042138
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739209}