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}

system_wrappers/source/runtime_enabled_features_default.cc

@@ -13,9 +13,7 @@
 #include "rtc_base/flags.h"
 
 namespace flags {
-DEFINE_bool(enable_dual_stream_mode,
-            false,
-            "Enables dual video stream mode.");
+DEFINE_bool(enable_dual_stream_mode, false, "Enables dual video stream mode.");
 }
 
 namespace webrtc {