Update audio code to use size_t more correctly, webrtc/modules/ portion.

webrtc/modules/utility/source/file_player_unittests.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 44 matching lines @@
   void PlayFileAndCheck(const std::string& input_file,
                         const std::string& ref_checksum,
                         int output_length_ms) {
     const float kScaling = 1;
     ASSERT_EQ(0,
               player_->StartPlayingFile(
                   input_file.c_str(), false, 0, kScaling, 0, 0, NULL));
     rtc::Md5Digest checksum;
     for (int i = 0; i < output_length_ms / 10; ++i) {
       int16_t out[10 * kSampleRateHz / 1000] = {0};
-      int num_samples;
+      size_t num_samples;
       EXPECT_EQ(0,
                 player_->Get10msAudioFromFile(out, num_samples, kSampleRateHz));
       checksum.Update(out, num_samples * sizeof(out[0]));
       if (FLAGS_file_player_output) {
-        ASSERT_EQ(static_cast<size_t>(num_samples),
+        ASSERT_EQ(num_samples,
                   fwrite(out, sizeof(out[0]), num_samples, output_file_));
       }
     }
     char checksum_result[rtc::Md5Digest::kSize];
     EXPECT_EQ(rtc::Md5Digest::kSize,
               checksum.Finish(checksum_result, rtc::Md5Digest::kSize));
     EXPECT_EQ(ref_checksum,
               rtc::hex_encode(checksum_result, sizeof(checksum_result)));
   }
 
@@ skipping 17 matching lines @@
       test::ResourcePath("utility/encapsulated_pcm16b_8khz", "wav");
   // The file is longer than this, but keeping the output shorter limits the
   // runtime for the test.
   const int kOutputLengthMs = 10000;
   const std::string kRefChecksum = "e41d7e1dac8aeae9f21e8e03cd7ecd71";
 
   PlayFileAndCheck(kFileName, kRefChecksum, kOutputLengthMs);
 }
 
 }  // namespace webrtc