Change kEnableAudioTrackProcessing to a disable flag and remove finch code

content/renderer/media/webrtc/webrtc_local_audio_track_adapter_unittest.cc

 // Copyright 2014 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 "base/command_line.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/mock_media_constraint_factory.h"
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 #include "content/renderer/media/webrtc_local_audio_track.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 70 matching lines @@
   sink.reset();
 
   // Verify that no more callback gets into the sink.
   track_->Capture(data.get(), base::TimeDelta(), 255, false, false);
 }
 
 TEST_F(WebRtcLocalAudioTrackAdapterTest, GetSignalLevel) {
   webrtc::AudioTrackInterface* webrtc_track =
       static_cast<webrtc::AudioTrackInterface*>(adapter_.get());
   int signal_level = 0;
+  EXPECT_TRUE(webrtc_track->GetSignalLevel(&signal_level));
+
+  // Disable the audio processing in the audio track.
+  CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kDisableAudioTrackProcessing);
   EXPECT_FALSE(webrtc_track->GetSignalLevel(&signal_level));
-
-  // Enable the audio processing in the audio track.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableAudioTrackProcessing);
-  EXPECT_TRUE(webrtc_track->GetSignalLevel(&signal_level));
 }
 
 }  // namespace content