Match existing type usage better.

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 59 matching lines @@
     EXPECT_CALL(mock_encoder_, MaxEncodedBytes())
         .WillRepeatedly(Return(kMockMaxEncodedBytes));
     cng_.reset(new AudioEncoderCng(config_));
     encoded_.resize(cng_->MaxEncodedBytes(), 0);
   }
 
   void Encode() {
     ASSERT_TRUE(cng_) << "Must call CreateCng() first.";
     encoded_info_ = cng_->Encode(timestamp_, audio_, num_audio_samples_10ms_,
                                  encoded_.size(), &encoded_[0]);
-    timestamp_ += num_audio_samples_10ms_;
+    timestamp_ += static_cast<uint32_t>(num_audio_samples_10ms_);
   }
 
   // Expect |num_calls| calls to the encoder, all successful. The last call
   // claims to have encoded |kMockMaxEncodedBytes| bytes, and all the preceding
   // ones 0 bytes.
   void ExpectEncodeCalls(int num_calls) {
     InSequence s;
     AudioEncoder::EncodedInfo info;
     for (int j = 0; j < num_calls - 1; ++j) {
       EXPECT_CALL(mock_encoder_, EncodeInternal(_, _, _, _))
@@ skipping 355 matching lines @@
       .WillRepeatedly(Return(7));
   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