Enable a ui test that plays video without audio stream

TEST=MediaTest.VideoBearSilentTheora
BUG=16012

Review URL: http://codereview.chromium.org/155375

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20423 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/media_uitest.cc

@@ -47,6 +47,17 @@ class MediaTest : public UITest {
   }
 };
 
+// <video> and <audio> only works stably on Windows.
+#if defined(OS_WIN)
+
+// TODO(hclam): The following test is disabled because it contains audio and
+// this test doesn't work with audio device.
 TEST_F(MediaTest, DISABLED_VideoBearH264) {
   PlayVideo("bear.mp4");
 }
+
+TEST_F(MediaTest, VideoBearSilentTheora) {
+  PlayVideo("bear_silent.ogv");
+}
+
+#endif