Delete unused cricket::VideoFrame methods MakeExclusive and CopyToFrame.

talk/app/webrtc/objc/public/RTCI420Frame.h

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 25 matching lines @@
 @property(nonatomic, readonly) NSUInteger chromaHeight;
 @property(nonatomic, readonly) NSUInteger chromaSize;
 // These can return NULL if the object is not backed by a buffer.
 @property(nonatomic, readonly) const uint8_t* yPlane;
 @property(nonatomic, readonly) const uint8_t* uPlane;
 @property(nonatomic, readonly) const uint8_t* vPlane;
 @property(nonatomic, readonly) NSInteger yPitch;
 @property(nonatomic, readonly) NSInteger uPitch;
 @property(nonatomic, readonly) NSInteger vPitch;
 
-- (BOOL)makeExclusive;
-
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 // Disallow init and don't add to documentation
 - (id)init __attribute__((
     unavailable("init is not a supported initializer for this class.")));
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
 @end
-