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/Classes/Metal/RTCMTLRGBRenderer.h

@@ -13,7 +13,8 @@
 #import "RTCMTLRenderer.h"
 
 /** @abstract RGB/BGR renderer.
- *  @discussion This renderer handles both kCVPixelFormatType_32BGRA and kCVPixelFormatType_32ARGB.
+ *  @discussion This renderer handles both kCVPixelFormatType_32BGRA and
+ * kCVPixelFormatType_32ARGB.
  */
 NS_AVAILABLE(10_11, 9_0)
 @interface RTCMTLRGBRenderer : RTCMTLRenderer

sdk/objc/Framework/Classes/Metal/RTCMTLRenderer.h

@@ -21,7 +21,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Protocol defining ability to render RTCVideoFrame in Metal enabled views.
  */
-@protocol RTCMTLRenderer<NSObject>
+@protocol RTCMTLRenderer <NSObject>
 
 /**
  * Method to be implemented to perform actual rendering of the provided frame.
@@ -49,7 +49,7 @@ NS_ASSUME_NONNULL_BEGIN
  * Implementation of RTCMTLRenderer protocol.
  */
 NS_AVAILABLE(10_11, 9_0)
-@interface RTCMTLRenderer : NSObject<RTCMTLRenderer>
+@interface RTCMTLRenderer : NSObject <RTCMTLRenderer>
 
 /** @abstract   A wrapped RTCVideoRotation, or nil.
     @discussion When not nil, the rotation of the actual frame is ignored when rendering.