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We should keep the same user policy as lock-screen media controls:
namely, the ambient media string should only be available on lock-screen
when the corresponding pref has been enabled.

Bug: b/167488694.
Test: unittested.
Change-Id: I26256f1160ab869054fa18ec4360ab2cfd6f1815
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380143
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804114}