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The embedder implementation assumes that channels are persistent and
set up ahead of time, so now we track RenderFrameHosts for our
WebContents and dispatch channel events to every frame

Bug: b/141864193
Test: on device with weather
Change-Id: I74182d226fae7d6d63b618aa92f60fadb9516d8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881671Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709971}