Disable test "test_videoDocumentTitle.html" due to random failures. b=492821

content/media/video/test/Makefile.in

@@ -93,7 +93,6 @@ _TEST_FILES += \
 		test_timeupdate1.html \
 		test_timeupdate2.html \
 		320x240.ogv \
-		test_videoDocumentTitle.html \
 		320x240.allow-origin.ogv \
 		320x240.allow-origin.ogv^headers^ \
 		bug461281.ogg \
@@ -108,6 +107,10 @@ _TEST_FILES += \
 		seek.ogv \
 		$(NULL)
 
+# This test disabled until we figure out random failures.
+# Bug 492821.
+# test_videoDocumentTitle.html
+
 ifneq ($(OS_ARCH),WINNT)
 # These tests are disabled on windows until we
 # figure out the random failures. See bug 475369.