Move MutableDataY{,U,V} methods to I420Buffer only.

webrtc/api/android/jni/androidvideocapturer_jni.cc

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 189 matching lines @@
   }
 
   int rotated_width = crop_width;
   int rotated_height = crop_height;
 
   if (capturer_->apply_rotation() && (rotation == 90 || rotation == 270)) {
     std::swap(adapted_width, adapted_height);
     std::swap(rotated_width, rotated_height);
   }
 
-  rtc::scoped_refptr<webrtc::VideoFrameBuffer> buffer =
+  rtc::scoped_refptr<webrtc::I420Buffer> buffer =
       pre_scale_pool_.CreateBuffer(rotated_width, rotated_height);
 
   const uint8_t* y_plane = static_cast<const uint8_t*>(video_frame);
   const uint8_t* uv_plane = y_plane + width * height;
 
   // Can only crop at even pixels.
   crop_x &= ~1;
   crop_y &= ~1;
   int uv_width = (width + 1) / 2;
 
@@ skipping 119 matching lines @@
 
 JOW(void, VideoCapturer_00024NativeObserver_nativeOnOutputFormatRequest)
     (JNIEnv* jni, jclass, jlong j_capturer, jint j_width, jint j_height,
         jint j_fps) {
   LOG(LS_INFO) << "NativeObserver_nativeOnOutputFormatRequest";
   reinterpret_cast<AndroidVideoCapturerJni*>(j_capturer)->OnOutputFormatRequest(
       j_width, j_height, j_fps);
 }
 
 }  // namespace webrtc_jni