Reformat the WebRTC code base

Running clang-format with chromium's style guide.

The goal is n-fold:
 * providing consistency and readability (that's what code guidelines are for)
 * preventing noise with presubmit checks and git cl format
 * building on the previous point: making it easier to automatically fix format issues
 * you name it

Please consider using git-hyper-blame to ignore this commit.

Bug: webrtc:9340
Change-Id: I694567c4cdf8cee2860958cfe82bfaf25848bb87
Reviewed-on: https://webrtc-review.googlesource.com/81185
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23660}

modules/video_coding/generic_decoder.h

@@ -81,20 +81,20 @@ class VCMGenericDecoder {
   ~VCMGenericDecoder();
 
   /**
-  * Initialize the decoder with the information from the VideoCodec
-  */
+   * Initialize the decoder with the information from the VideoCodec
+   */
   int32_t InitDecode(const VideoCodec* settings, int32_t numberOfCores);
 
   /**
-  * Decode to a raw I420 frame,
-  *
-  * inputVideoBuffer reference to encoded video frame
-  */
+   * Decode to a raw I420 frame,
+   *
+   * inputVideoBuffer reference to encoded video frame
+   */
   int32_t Decode(const VCMEncodedFrame& inputFrame, int64_t nowMs);
 
   /**
-  * Set decode callback. Deregistering while decoding is illegal.
-  */
+   * Set decode callback. Deregistering while decoding is illegal.
+   */
   int32_t RegisterDecodeCompleteCallback(VCMDecodedFrameCallback* callback);
 
   bool External() const;