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This method was previously unused, but with the network service moving
out of process, the speech recognition code will now need to use it.

Bug: 841445
Change-Id: I886b10dbe6a4687ddb6e72e5296398f01534f221
Reviewed-on: https://chromium-review.googlesource.com/1145709
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580391}