Change Audio/VideoDecoder OutputCB to no longer take "const scoped_refptr<>&"

Refactoring to get rid of "const scoped_refptr<VideoFrame>&" and
"const scoped_refptr<AudioBuffer>&" parameters from the callbacks.

BUG=946265
TEST=compiles

Change-Id: Ic7e4f7b33d87f072dadd7f86b2ef181324d111d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583345
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654589}

• chromecast/media/cma/decoder/cast_audio_decoder.cc[diff]
• content/renderer/media/stream/webmediaplayer_ms.cc[diff]
• content/renderer/media/webrtc/rtc_video_decoder_adapter.cc[diff]
• content/renderer/media/webrtc/rtc_video_decoder_adapter.h[diff]
• content/renderer/media/webrtc/webrtc_video_frame_adapter.cc[diff]
• content/renderer/media/webrtc/webrtc_video_frame_adapter.h[diff]
• content/renderer/pepper/video_decoder_shim.cc[diff]
• media/base/audio_decoder.h[diff]
• media/base/video_decoder.h[diff]
• media/base/video_thumbnail_decoder.cc[diff]
• media/base/video_thumbnail_decoder.h[diff]
• media/cast/sender/h264_vt_encoder_unittest.cc[diff]
• media/cdm/library_cdm/clear_key_cdm/cdm_video_decoder.cc[diff]
• media/filters/audio_decoder_stream_unittest.cc[diff]
• media/filters/audio_decoder_unittest.cc[diff]
• media/filters/dav1d_video_decoder_unittest.cc[diff]
• media/filters/decoder_selector_unittest.cc[diff]
• media/filters/decoder_stream.cc[diff]
• media/filters/decoder_stream.h[diff]
• media/filters/decrypting_audio_decoder_unittest.cc[diff]
• media/filters/decrypting_video_decoder_unittest.cc[diff]
• media/filters/fake_video_decoder_unittest.cc[diff]
• media/filters/ffmpeg_video_decoder_unittest.cc[diff]
• media/filters/fuchsia/fuchsia_video_decoder_unittest.cc[diff]
• media/filters/offloading_video_decoder_unittest.cc[diff]
• media/filters/video_decoder_stream_unittest.cc[diff]
• media/filters/vpx_video_decoder_fuzzertest.cc[diff]
• media/filters/vpx_video_decoder_unittest.cc[diff]
• media/gpu/android/media_codec_video_decoder_unittest.cc[diff]
• media/gpu/test/video_player/video_decoder_client.cc[diff]
• media/gpu/test/video_player/video_decoder_client.h[diff]
• media/gpu/video_encode_accelerator_unittest.cc[diff]
• media/mojo/clients/mojo_audio_decoder_unittest.cc[diff]
• media/mojo/services/mojo_audio_decoder_service.cc[diff]
• media/mojo/services/mojo_audio_decoder_service.h[diff]
• media/mojo/services/mojo_video_decoder_service.cc[diff]
• media/mojo/services/mojo_video_decoder_service.h[diff]
• media/renderers/audio_renderer_impl.cc[diff]
• media/renderers/audio_renderer_impl.h[diff]
• media/renderers/video_renderer_impl.cc[diff]
• media/renderers/video_renderer_impl.h[diff]
• media/video/gpu_memory_buffer_video_frame_pool.cc[diff]
• media/video/gpu_memory_buffer_video_frame_pool.h[diff]
• media/video/gpu_memory_buffer_video_frame_pool_unittest.cc[diff]
• media/video/mock_gpu_memory_buffer_video_frame_pool.cc[diff]
• media/video/mock_gpu_memory_buffer_video_frame_pool.h[diff]