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All IPC messages for RenderWidgets have been moved to mojo. The routing
ID is no longer used inside RenderWidget (it still defines the
viz::FrameSinkId) so it can't be removed from the IPC messages yet. A
followup change will make CreateNewPopupWidget async.

BUG=1097816

Change-Id: I6cd6c9c49031c29aa8f97f0e6a9246c7c0338b78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510769
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822812}