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This CL migrates the legacy IPC message out of extension_messages.h to
Renderer mojo interface from extensions.mojom.

Bug: 1165812
Change-Id: Id53cdd68da19509682067a067ff544ff04128c87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627410Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Antia Puentes <apuentes@igalia.com>
Cr-Commit-Position: refs/heads/master@{#843443}