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It now takes an XPC protocol as a parameter and mocks the service
specified. Some type safety is lost in the process, since I had to
convert id<P> to raw id in a few spots; I spend a while trying to
figure out how to do this with templates and concluded that I probably
couldn't (because C++ does not understand an Objective-C protocol,
since it is completely outside the C++ type system), and figured the unchecked type is tolerable in test code.

Bug: 1055876
Change-Id: I2fe5684b34b64245f6d9fe7716c9bdf7cd97c76e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231703Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Adam Norberg <norberg@google.com>
Cr-Commit-Position: refs/heads/master@{#776576}