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Currently there are two nearly-identical declarations/definitions of
MonotonicClockNow: one in MediaPipelineBackendForMixer, and one in
internal chromecast code. With this change, we can use the same function
for both use cases to avoid repeated code.

Test: cast_audio_backend_unittests pass
Bug: b/139928913
Change-Id: Ibe2216b92a0a8f6529297c7ffe35220cad871046
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771053Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Antonio Rivera <antoniori@google.com>
Auto-Submit: Antonio Rivera <antoniori@google.com>
Cr-Commit-Position: refs/heads/master@{#690830}