Disable flaky OutOfProcessPPAPITest.MediaStreamAudioTrack on Windows

content/test/ppapi/ppapi_browsertest.cc

Index: content/test/ppapi/ppapi_browsertest.cc
diff --git a/content/test/ppapi/ppapi_browsertest.cc b/content/test/ppapi/ppapi_browsertest.cc
index 704e7045d85acc098e2e5103f5263b63f092efd4..6e65b7127c81d2f38a8adb2816f512636ef1d96a 100644
--- a/content/test/ppapi/ppapi_browsertest.cc
+++ b/content/test/ppapi/ppapi_browsertest.cc
@@ -101,7 +101,13 @@ IN_PROC_BROWSER_TEST_F(OutOfProcessPPAPITest,
   RunTestAndReload("Instance_RecursiveObjects");
 }
 
-TEST_PPAPI_OUT_OF_PROCESS(MediaStreamAudioTrack)
+#if defined(OS_WIN)
+// Flaky on Windows (crbug.com/438729)
+#define MAYBE_MediaStreamAudioTrack DISABLED_MediaStreamAudioTrack;
+#else
+#define MAYBE_MediaStreamAudioTrack MediaStreamAudioTrack;
+#endif
+TEST_PPAPI_OUT_OF_PROCESS(MAYBE_MediaStreamAudioTrack)
 
 TEST_PPAPI_OUT_OF_PROCESS(MediaStreamVideoTrack)