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}

sdk/objc/Framework/Headers/WebRTC/RTCDataChannelConfiguration.h

@@ -45,7 +45,7 @@ RTC_EXPORT
 @property(nonatomic, assign) int channelId;
 
 /** Set by the application and opaque to the WebRTC implementation. */
-@property(nonatomic) NSString *protocol;
+@property(nonatomic) NSString* protocol;
 
 @end