Disables failing (low-latency) audio unit tests on Windows 7.

media/audio/win/audio_low_latency_output_win_unittest.cc

Index: media/audio/win/audio_low_latency_output_win_unittest.cc
diff --git a/media/audio/win/audio_low_latency_output_win_unittest.cc b/media/audio/win/audio_low_latency_output_win_unittest.cc
index 9cf3b0b1fc646ee007e2e26d09c346987d206e78..f2c0c811caa364764e567127a31ebb97c647ed16 100644
--- a/media/audio/win/audio_low_latency_output_win_unittest.cc
+++ b/media/audio/win/audio_low_latency_output_win_unittest.cc
@@ -451,7 +451,10 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestPacketSizeInSamples) {
   aos->Close();
 }
 
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestMono) {
+// TODO(henrika): enable this test again using an improved fall-back
+// mechanism for those platforms which does not support mono output.
+// See crbug.com/112986 for details.
+TEST(WinAudioOutputTest, DISABLED_WASAPIAudioOutputStreamTestMono) {
   scoped_refptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager))
     return;