Move functionality out from AudioFrame and into AudioFrameOperations.

This CL is in preparation to move the AudioFrame into webrtc/api. The
AudioFrame is a POD type used for representing 10ms of audio. It
appears as a parameter and return value of interfaces being migrated
to webrtc/api, in particular AudioMixer.

Here, methods operator+=, operator>>=, Mute are
moved into a new target webrtc/audio/utility/audio_frame_operations,
and dependencies are changed to use
the new versions. The old AudioFrame methods are marked deprecated.

The audio frame utilities in webrtc/modules/utility:audio_frame_operations
are also moved to the new location.

TBR=kjellander@webrtc.org
BUG=webrtc:6548
NOPRESUBMIT=True

Review-Url: https://codereview.webrtc.org/2424173003
Cr-Commit-Position: refs/heads/master@{#15413}
diff --git a/webrtc/voice_engine/utility.cc b/webrtc/voice_engine/utility.cc
index 88c60fd..595c711 100644
--- a/webrtc/voice_engine/utility.cc
+++ b/webrtc/voice_engine/utility.cc
@@ -10,13 +10,13 @@
 
 #include "webrtc/voice_engine/utility.h"
 
+#include "webrtc/audio/utility/audio_frame_operations.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/common_audio/resampler/include/push_resampler.h"
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/modules/utility/include/audio_frame_operations.h"
 #include "webrtc/voice_engine/voice_engine_defines.h"
 
 namespace webrtc {