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/testsupport/perf_test.cc

@@ -121,8 +121,7 @@ class PerfResultsLogger {
   }
 
   rtc::CriticalSection crit_;
-  FILE* output_
-      RTC_GUARDED_BY(&crit_);
+  FILE* output_ RTC_GUARDED_BY(&crit_);
   std::map<std::string, std::vector<std::string>> graphs_
       RTC_GUARDED_BY(&crit_);
 };