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This CL proposes a few editorial changes to some VEA-related
files, namely to rtc_video_encoder.h:
- Makes RecordInitEncodeUMA() a file-static function 
- Uses __func__ pervasively in DVLOG() statements to save some
 lines.
In gpu_video_encode_accelerator_host.cc:
- prefers early return
- micro DVLOG cleanup

** No new code, except the early returns **

Bug: 736517
Change-Id: I2c6cd351a0716810338fa3a2e87e2ef3ca708cbf
Reviewed-on: https://chromium-review.googlesource.com/564743Reviewed-by: Wu-Cheng Li <wuchengli@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485188}