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This simplifies the interface a bit, and allows us to avoid any
potential issues with argument ordering in RenderFrameHostImpl::FromID,
or otherwise.

Change-Id: I0c9d9fe921a5b0ca8765e9d7c8ae6196dc329e5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419663Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813028}