Move array_view.h to webrtc/api/

webrtc/modules/audio_processing/test/echo_canceller_test_tools.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_TEST_ECHO_CANCELLER_TEST_TOOLS_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_TEST_ECHO_CANCELLER_TEST_TOOLS_H_
 
 #include <algorithm>
 #include <vector>
 
-#include "webrtc/rtc_base/array_view.h"
+#include "webrtc/api/array_view.h"
 #include "webrtc/rtc_base/constructormagic.h"
 #include "webrtc/rtc_base/random.h"
 
 namespace webrtc {
 
 // Randomizes the elements in a vector with values -32767.f:32767.f.
 void RandomizeSampleVector(Random* random_generator, rtc::ArrayView<float> v);
 
 // Class for delaying a signal a fixed number of samples.
 template <typename T>
 class DelayBuffer {
  public:
   explicit DelayBuffer(size_t delay) : buffer_(delay) {}
   ~DelayBuffer() = default;
 
   // Produces a delayed signal copy of x.
   void Delay(rtc::ArrayView<const T> x, rtc::ArrayView<T> x_delayed);
 
  private:
   std::vector<T> buffer_;
   size_t next_insert_index_ = 0;
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBuffer);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_ECHO_CANCELLER_TEST_TOOLS_H_