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This CL moves the google_streaming_api.proto from
content/browser/speech/proto to content/public/browser/proto. The proto
file is used by both content/browser/speech and chrome/services/speech.

Bug: 1094490
Change-Id: I2bbed933e4256cf0960b65b95a23a913aa6276d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2243714Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#779593}