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This is the first step towards merging DispatcherHost into BackendImpl.

Bug: none
Change-Id: If0a387b71968823cd50dfff628f758ef6fc01e63
Reviewed-on: https://chromium-review.googlesource.com/c/1450752
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628573}