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In order to bind a local associated interface you need to use the testing
API. While the API is poorly named due to mojo team previously did agree
that the ForTesting suffix should be removed for cases such as these.

BUG=1084849,1085031,1082648
TBR=tommycli@chromium.org

Change-Id: I2413fcc8633cd3db75f3c4eefcff763b29ca714c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210488Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770817}