[Mojo Video Capture] Adapt video_capture service to refactored video capture stack

media/capture/video/video_capture_buffer_handle.h

Index: media/capture/video/video_capture_buffer_handle.h
diff --git a/media/capture/video/video_capture_buffer_handle.h b/media/capture/video/video_capture_buffer_handle.h
index 5dd15ebd26650666057a7f3e758549a31c7defea..657ebc92664214dc7cf8c420bb5561f19f6de3ac 100644
--- a/media/capture/video/video_capture_buffer_handle.h
+++ b/media/capture/video/video_capture_buffer_handle.h
@@ -18,8 +18,8 @@ class CAPTURE_EXPORT VideoCaptureBufferHandle {
  public:
   virtual ~VideoCaptureBufferHandle() {}
   virtual size_t mapped_size() const = 0;
-  virtual uint8_t* data() = 0;
-  virtual const uint8_t* data() const = 0;
+  virtual uint8_t* data() const = 0;
+  virtual const uint8_t* const_data() const = 0;
 };
 
 }  // namespace media