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What: Ensure the CM runtime feature only looks enabled in renderer when
the browser process base::Feature is also enabled.

Why: It is currently impossible to do feature detection for the API,
as you do not know whether the client has the browser feature enabled.

How: Adds a depends_on condition to our existing runtime feature which
uses a webruntime feature matching the browser process base::Feature.

This requires removing API related expectations from
web_tests/webexposed until the browser side feature is enabled by
default/for testing.

Bug: 1115786
Change-Id: I1db0583551d25cc3def51a89ebddbbbed675362a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353732Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799917}