VideoFrameBuffer: Make non-const data access explicit

webrtc/test/fake_texture_frame.h

 /*
  *  Copyright (c) 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.
  */
 #ifndef WEBRTC_TEST_FAKE_TEXTURE_FRAME_H_
@@ skipping 16 matching lines @@
   ~FakeNativeHandleBuffer() {
     delete reinterpret_cast<FakeNativeHandle*>(native_handle_);
   }
 
  private:
   rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override {
     rtc::scoped_refptr<VideoFrameBuffer> buffer(
         new rtc::RefCountedObject<I420Buffer>(width_, height_));
     int half_height = (height_ + 1) / 2;
     int half_width = (width_ + 1) / 2;
-    memset(buffer->data(kYPlane), 0, height_ * width_);
-    memset(buffer->data(kUPlane), 0, half_height * half_width);
-    memset(buffer->data(kVPlane), 0, half_height * half_width);
+    memset(buffer->MutableData(kYPlane), 0, height_ * width_);
+    memset(buffer->MutableData(kUPlane), 0, half_height * half_width);
+    memset(buffer->MutableData(kVPlane), 0, half_height * half_width);
     return buffer;
   }
 };
 
 static VideoFrame CreateFakeNativeHandleFrame(FakeNativeHandle* native_handle,
                                               int width,
                                               int height,
                                               uint32_t timestamp,
                                               int64_t render_time_ms,
                                               VideoRotation rotation) {
   return VideoFrame(new rtc::RefCountedObject<FakeNativeHandleBuffer>(
                         native_handle, width, height),
                     timestamp, render_time_ms, rotation);
 }
 }  // namespace test
 }  // namespace webrtc
 #endif  //  WEBRTC_TEST_FAKE_TEXTURE_FRAME_H_