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The ActiveURL is now set via messages sent on the LocalFrame.
Hopefully this will help improve crash reports. This use to occur
in RenderFrameImpl::OnMessageReceived.

BUG=993189

Change-Id: I184ef2892b550fb79ced43c2c48315f68dd6c358
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521078Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826367}