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Previously SysmemBufferWriterQueue wasn't handling properly the case
when a packet is destroyed after ResetBuffers(). Updated ResetBuffers()
to drop weak pointers, to ensure that ReleaseBuffer() is not called
after ResetBuffers().

Bug: 1021646
Change-Id: I75045ce7427eb0c539bd198bb73a5a742531f0f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899319
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712730}