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Mojo bindings were incorrectly registered since r480972, resulting in
calls to Navigator.getInstalledRelatedApps never resolving or rejecting.
This correctly registers with a RenderFrameHost, not WebContents.

Adds an end-to-end test for getInstalledRelatedApps on Android, which
would've caught this breakage. (The feature is already covered by Blink
Layout Tests and Android Java unit tests, but there was nothing that
ensures the whole system is working.)

Bug: 750348
Change-Id: Ife895f26c42c6344906ea842ffb48f73d881b236
Reviewed-on: https://chromium-review.googlesource.com/597608
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491924}