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}

test/frame_generator.h

@@ -99,8 +99,8 @@ class FrameGenerator {
 
   // Creates a frame generator that produces randomly generated slides.
   // frame_repeat_count determines how many times each slide is shown.
-  static std::unique_ptr<FrameGenerator> CreateSlideGenerator(
-      int width, int height, int frame_repeat_count);
+  static std::unique_ptr<FrameGenerator>
+  CreateSlideGenerator(int width, int height, int frame_repeat_count);
 };
 }  // namespace test
 }  // namespace webrtc