Turn webrtc::Vad into a pure virtual interface

webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng_unittest.cc

 /*
  *  Copyright (c) 2014 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.
  */
 
@@ skipping 16 matching lines @@
 namespace {
 static const size_t kMockMaxEncodedBytes = 1000;
 static const size_t kMaxNumSamples = 48 * 10 * 2;  // 10 ms @ 48 kHz stereo.
 static const size_t kMockReturnEncodedBytes = 17;
 static const int kCngPayloadType = 18;
 }
 
 class AudioEncoderCngTest : public ::testing::Test {
  protected:
   AudioEncoderCngTest()
-      : mock_vad_(new MockVad(Vad::kVadNormal)),
+      : mock_vad_(new MockVad),
         timestamp_(4711),
         num_audio_samples_10ms_(0),
         sample_rate_hz_(8000) {
     memset(audio_, 0, kMaxNumSamples * 2);
     config_.speech_encoder = &mock_encoder_;
     EXPECT_CALL(mock_encoder_, NumChannels()).WillRepeatedly(Return(1));
     // Let the AudioEncoderCng object use a MockVad instead of its internally
     // created Vad object.
     config_.vad = mock_vad_;
     config_.payload_type = kCngPayloadType;
@@ skipping 407 matching lines @@
       .WillRepeatedly(Return(7U));
   for (int i = 0; i < 6; ++i)
     Encode();
   EXPECT_DEATH(Encode(),
                "Frame size cannot be larger than 60 ms when using VAD/CNG.");
 }
 
 #endif  // GTEST_HAS_DEATH_TEST
 
 }  // namespace webrtc