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This CL changes FrameMsg_IntrinsicSizingInfoOfChildChanged so that it
is implemented in the RemoteFrame interface since it is only got
through RenderFrameProxy.

It introduces intrinsic_sizing_info.mojom to have the type used in
IntrinsicSizingInfoOfChildChanged().

Bug: 1044304
Change-Id: I7bb41d53a415f4bd8a4eb87c270d23c28c83b27b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015866
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736733}