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To better bind the lifetime of the camera proxy activity with CCA,
we should close CCA when camera proxy activity is manually destroyed.

The corresponding CL on ARC++ side is:
http://ag/9481116

Bug: 980812, 967611, b/131809655, b/134635999
Test: Tested with Hangouts app and CCA is closed as Hangouts closed.
Change-Id: I0050ba69ec8771c3064308131cdfdbc123adca4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835072
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709372}