Move array_view.h to webrtc/api/

webrtc/modules/audio_processing/agc2/digital_gain_applier.h

 /*
  *  Copyright (c) 2017 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_MODULES_AUDIO_PROCESSING_AGC2_DIGITAL_GAIN_APPLIER_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AGC2_DIGITAL_GAIN_APPLIER_H_
 
+#include "webrtc/api/array_view.h"
 #include "webrtc/modules/audio_processing/audio_buffer.h"
-#include "webrtc/rtc_base/array_view.h"
 
 namespace webrtc {
 
 class DigitalGainApplier {
  public:
   DigitalGainApplier();
 
   // Applies the specified gain to an array of samples.
   void Process(float gain, rtc::ArrayView<float> samples);
 
  private:
   void LimitToAllowedRange(rtc::ArrayView<float> x);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AGC2_DIGITAL_GAIN_APPLIER_H_