clang/win: Let remaining chromium_code targets build with -Wextra.

media/audio/win/audio_low_latency_output_win_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/environment.h"
 #include "base/files/file_util.h"
@@ skipping 414 matching lines @@
   ReadFromFileAudioSource file_source(file_name);
 
   DVLOG(0) << "File name      : " << file_name.c_str();
   DVLOG(0) << "Sample rate    : " << aosw.sample_rate();
   DVLOG(0) << "Bits per sample: " << aosw.bits_per_sample();
   DVLOG(0) << "#channels      : " << aosw.channels();
   DVLOG(0) << "File size      : " << file_source.file_size();
   DVLOG(0) << "#file segments : " << kNumFileSegments;
   DVLOG(0) << ">> Listen to the stereo file while playing...";
 
-  for (int i = 0; i < kNumFileSegments; i++) {
+  for (size_t i = 0; i < kNumFileSegments; i++) {
     // Each segment will start with a short (~20ms) block of zeros, hence
     // some short glitches might be heard in this test if kNumFileSegments
     // is larger than one. The exact length of the silence period depends on
     // the selected sample rate.
     aos->Start(&file_source);
     base::PlatformThread::Sleep(
         base::TimeDelta::FromMilliseconds(kFileDurationMs / kNumFileSegments));
     aos->Stop();
   }
 
@@ skipping 171 matching lines @@
 
   aos->Start(&source);
   loop.PostDelayedTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
                        TestTimeouts::action_timeout());
   loop.Run();
   aos->Stop();
   aos->Close();
 }
 
 }  // namespace media