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AppWebMessagePort is the only implementation of the interface MessagePort.
Replaced the direct reference to the class with the interface and added
a public helper method |MessagePort.createPair()|. That makes
AppWebMessagePort an implementation detail, and exposes only the public
interface to embedders. Updated DEPS rules to remove the exception.

Bug: 617324
Change-Id: I3f35c2db2436bc3c82a00c07cfede1062d447d29
Reviewed-on: https://chromium-review.googlesource.com/1031690
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554689}