Disable WebRTCAudioQualityTest on Windows.

These tests are run as manual tests but currently fails on the webrtc bots.

https://build.chromium.org/p/chromium.webrtc/builders/Win7%20Tester/builds/29076

BUG=642294
TBR=phoglund@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2292043002
Cr-Commit-Position: refs/heads/master@{#415274}

chrome/browser/media/webrtc_audio_quality_browsertest.cc

@@ -61,10 +61,11 @@ const int kMaxAgcSegmentDiffMs =
   200;
 #endif
 
-#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
+#if defined(OS_LINUX) || defined(OS_MACOSX)
 #define MAYBE_WebRtcAudioQualityBrowserTest WebRtcAudioQualityBrowserTest
 #else
 // Not implemented on Android, ChromeOS etc.
+// Currently fails on Windows bots. http://crbug.com/642294.
 #define MAYBE_WebRtcAudioQualityBrowserTest DISABLED_WebRtcAudioQualityBrowserTest
 #endif