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This changes the video_capture service to use ServiceBinding for its
Service interface binding, eliminating reliance on ServiceContext as
well as EmebddedServiceInfo etc for content integration.

Bug: 891780
Change-Id: Ic1b89aa5487e230b4fafef2fdddf4b0e8e307b3c
Reviewed-on: https://chromium-review.googlesource.com/c/1311797Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#604934}