Disable Mac AVFoundation for WebRTC browser tests.

chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc

Index: chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc
diff --git a/chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc b/chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc
index e35165e7abfc3ae9ec33fda96ed9236b4fea0df6..e0e1051d4fc181a0ffa128dbbbf57c27af686a1d 100644
--- a/chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc
+++ b/chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc
@@ -112,6 +112,12 @@ class WebRtcVideoQualityBrowserTest : public WebRtcTestBase {
         command_line->HasSwitch(switches::kUseFakeDeviceForMediaStream))
         << "You cannot run this test with fake devices.";
 
+#if defined(OS_MACOSX)
+    // TODO(mcasas): Remove this switch when ManyCam virtual video capture
+    // device starts supporting AVFoundation, see http://crbug.com/327618.
+    command_line->AppendSwitch(switches::kDisableAVFoundation);
+#endif
+
     // The video playback will not work without a GPU, so force its use here.
     command_line->AppendSwitch(switches::kUseGpuInTests);
   }