Disable WebRTC DataChannel GC test on Windows.

content/browser/media/webrtc/webrtc_datachannel_browsertest.cc

Index: content/browser/media/webrtc/webrtc_datachannel_browsertest.cc
diff --git a/content/browser/media/webrtc/webrtc_datachannel_browsertest.cc b/content/browser/media/webrtc/webrtc_datachannel_browsertest.cc
index fb38cc7145847ffa5791808b6f45971a9761a9b9..9f72ab836acf463c4f85c9a4468de3a868dd93ba 100644
--- a/content/browser/media/webrtc/webrtc_datachannel_browsertest.cc
+++ b/content/browser/media/webrtc/webrtc_datachannel_browsertest.cc
@@ -16,9 +16,10 @@ const char kDataChannelHtmlFile[] = "/media/datachannel_test.html";
 
 namespace content {
 
-#if defined(OS_ANDROID) && defined(ADDRESS_SANITIZER)
+#if defined(OS_WIN) || (defined(OS_ANDROID) && defined(ADDRESS_SANITIZER))
 // GC does not work correctly in some cases under Android ASAN.
 // See https://crbug.com/611620.
+// This test has become flaky on Windows. See https://crbug.com/616388
 #define MAYBE_WebRtcDataChannelTest DISABLED_WebRtcDataChannelTest
 #else
 #define MAYBE_WebRtcDataChannelTest WebRtcDataChannelTest