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Switches uses of PrintResult in the WebRTC browser perf tests to
PerfResultReporter and whitelists browser_tests for conversion to
histograms before uploading to the perf dashboard.

Bug: 923564
Change-Id: I7ff090bcdeaf3906491b85993456f07313cd4a52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856825Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706699}