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This is a reland of 31b56eca.

The original CL failed the chromeos-kevin-rel bot because it triggered
some race condition in the camera service. Now that camera service has
been fixed, and the chromeos-kevin-rel trybot is passing, this CL is
ready for a reland.

This CL is updated a bit from the original CL:
* We only connect to the camera service if
  media::ShouldUseCrosCameraService() returns true
* We check against both CameraClientType::UNKNOWN and ...::PLUGINVM
* Changes in user_session_initializer are removed because we have
  another CL (2586286) for it.

Original change's description:
> Connect VmCameraMicManager with camera service for PluginVM
>
> The camera notification/indicator is shown when PluginVM accesses camera
> now. Note that flags pluginvm-show-camera-permissions and
> vm-camera-mic-indicators-and-notifications need to be turned on.
>
> Bug: b/167491603
> Change-Id: Ib2e3f7bc85531313811d2525ecac394aadee6e17
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557122
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Joel Hockey <joelhockey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#832576}

Bug: b/167491603
Change-Id: Ibc01c2144bd8c7b5ba704abff9a8ccd1adec3d05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573936
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836501}