Disabling VP9 perf test

BUG=webrtc:4889

Review URL: https://codereview.webrtc.org/1258853004

Cr-Commit-Position: refs/heads/master@{#9668}
diff --git a/webrtc/video/full_stack.cc b/webrtc/video/full_stack.cc
index 1220482..008116c 100644
--- a/webrtc/video/full_stack.cc
+++ b/webrtc/video/full_stack.cc
@@ -753,8 +753,9 @@
   RunTest(screenshare_params);
 }
 
-// Disabled on Android along with VP8 screenshare above.
-TEST_F(FullStackTest, DISABLED_ON_ANDROID(ScreenshareSlidesVP9_2TL)) {
+// Temporarilty disabled.
+// https://code.google.com/p/webrtc/issues/detail?id=4889
+TEST_F(FullStackTest, DISABLED_ScreenshareSlidesVP9_2TL) {
   FullStackTestParams screenshare_params = {
       "screenshare_slides_vp9_2tl",
       {"screenshare_slides", 1850, 1110, 5},