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Instead of using a command line flag, the feature is toggled by an
AndroidManifest entry. This is more ergonomic for developers as they
don't need to use a debug build of Android to toggle the feature.

Bug: 1057100
Change-Id: Icdc6676d1b15e43a46ebb6d14276cef89ff4942f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480705
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818779}