Corrects a WebRTC UMA histogram name
Corrects a WebRTC UMA histogram name

In https://codereview.chromium.org/1217483003/ the histogram WebRTC.Audio.PlatformReportedStreamDelayJump was spelled as WebRTC.Audio.ReportedStreamDelayJump.

Now corrected.

BUG=488124
TBR=isherman@chromium.org

Review URL: https://codereview.chromium.org/1217993005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337273}

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