Disable MSE_ClearKey/EncryptedMediaTest.Playback_VP9Video_WebM/0 as its failing often.

chrome/browser/media/encrypted_media_browsertest.cc

Index: chrome/browser/media/encrypted_media_browsertest.cc
diff --git a/chrome/browser/media/encrypted_media_browsertest.cc b/chrome/browser/media/encrypted_media_browsertest.cc
index 65a728076a0a7c483330795c61dd9399d5011ccb..4fc666fa0f35d76d56ce0b941e5c94ee50048377 100644
--- a/chrome/browser/media/encrypted_media_browsertest.cc
+++ b/chrome/browser/media/encrypted_media_browsertest.cc
@@ -533,7 +533,8 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoClearAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-v.webm", kWebMAudioVideo);
 }
 
-IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VP9Video_WebM) {
+// http://crbug.com/402766
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, DISABLED_Playback_VP9Video_WebM) {
   TestSimplePlayback("bear-320x240-v-vp9_enc-v.webm", kWebMVP9VideoOnly);
 }