Run H264 instead of Youtube perf for presubmit

WidevineYouTubePerformanceTests has been flaky on cuttlefish,
e.g. http://ab/I19300007386488046.

Bug: 178816546
Test: TreeHugger
Change-Id: I889787dd22f7685bd2d22eede2d066d442c23c70
diff --git a/media/TEST_MAPPING b/media/TEST_MAPPING
index 80e0924..5bc7262 100644
--- a/media/TEST_MAPPING
+++ b/media/TEST_MAPPING
@@ -30,7 +30,7 @@
                     "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
                 },
                 {
-                    "include-filter": "com.google.android.media.gts.WidevineYouTubePerformanceTests"
+                    "include-filter": "com.google.android.media.gts.WidevineH264PlaybackTests"
                 }
             ]
         }