Revert of Enabling audio quality test on mac.

chrome/browser/media/chrome_webrtc_audio_quality_browsertest.cc

 // Copyright 2013 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 <ctime>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
@@ skipping 321 matching lines @@
   // There are two tab-separated numbers on the format x.xxx, e.g. 5 chars each.
   std::size_t first_number_pos = anchor_pos + result_anchor.length();
   *raw_mos = result.substr(first_number_pos, 5);
   EXPECT_TRUE(CanParseAsFloat(*raw_mos)) << "Failed to parse raw MOS number.";
   *mos_lqo = result.substr(first_number_pos + 5 + 1, 5);
   EXPECT_TRUE(CanParseAsFloat(*mos_lqo)) << "Failed to parse MOS LQO number.";
 
   return true;
 }
 
-#if defined(OS_LINUX) || defined(OS_WIN) || defined(OS_MACOSX)
+#if defined(OS_LINUX) || defined(OS_WIN)
+// Only implemented on Linux and Windows for now.
 #define MAYBE_MANUAL_TestAudioQuality MANUAL_TestAudioQuality
 #else
-// Not implemented on Android, ChromeOS etc.
 #define MAYBE_MANUAL_TestAudioQuality DISABLED_MANUAL_TestAudioQuality
 #endif
 
 IN_PROC_BROWSER_TEST_F(WebRtcAudioQualityBrowserTest,
                        MAYBE_MANUAL_TestAudioQuality) {
   if (OnWinXp()) {
     LOG(ERROR) << "This test is not implemented for Windows XP.";
     return;
   }
   if (OnWin8()) {
@@ skipping 60 matching lines @@
       test::GetReferenceFilesDir().Append(kReferenceFile);
   ASSERT_TRUE(RunPesq(reference_file_in_test_dir, trimmed_recording, 16000,
                       &raw_mos, &mos_lqo));
 
   perf_test::PrintResult("audio_pesq", "", "raw_mos", raw_mos, "score", true);
   perf_test::PrintResult("audio_pesq", "", "mos_lqo", mos_lqo, "score", true);
 
   EXPECT_TRUE(base::DeleteFile(recording, false));
   EXPECT_TRUE(base::DeleteFile(trimmed_recording, false));
 }