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This CL migrates AwViewHostMsg_OnContentsSizeChanged
to FrameHost interface. This CL uses AssociatedRemote
to keep the message order.

OnMessageReceived() is removed because AwRenderViewHostExt
doesn't handle IPC message anymore.

Bug: 1157128
Change-Id: If1e6132ac4c99cb1f1f7ee484a424ba5cc3a75a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592269Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#837870}