Change kEnableAudioTrackProcessing to a disable flag and remove finch code

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/file_util.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
@@ skipping 81 matching lines @@
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     // This test expects real device handling and requires a real webcam / audio
     // device; it will not work with fake devices.
     EXPECT_FALSE(command_line->HasSwitch(
         switches::kUseFakeDeviceForMediaStream));
     EXPECT_FALSE(command_line->HasSwitch(
         switches::kUseFakeUIForMediaStream));
 
     bool enable_audio_track_processing = GetParam();
-    if (enable_audio_track_processing)
-      command_line->AppendSwitch(switches::kEnableAudioTrackProcessing);
+    if (!enable_audio_track_processing)
+      command_line->AppendSwitch(switches::kDisableAudioTrackProcessing);
   }
 
   void AddAudioFile(const std::string& input_file_relative_url,
                     content::WebContents* tab_contents) {
     EXPECT_EQ("ok-added", ExecuteJavascript(
         "addAudioFile('" + input_file_relative_url + "')", tab_contents));
   }
 
   void PlayAudioFile(content::WebContents* tab_contents) {
     EXPECT_EQ("ok-playing", ExecuteJavascript("playAudioFile()", tab_contents));
@@ skipping 298 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));
 }