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This CL adds FrameServiceBase which is a base class for mojo interface
implementations that is tied to the lifetime of a document.

Also updates MediaDrmStorageImpl, OutputProtectionImpl and
PlatformVerificationImpl to use the new FrameServiceBase class.

TBR=halliwell@chromium.org,mnissler@chromium.org
BUG=707335
TEST=New unit tests for FrameServiceBase

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: I7f69f70a3da24c784267ecc1d49fd681bbf1a71a
Reviewed-on: https://chromium-review.googlesource.com/678438
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506979}