Bug 1120144 - Disable test_bug641198.html until it can be rewritten. r=me

--HG--
extra : rebase_source : 204ab661ec2bccc52aa82a00b912d9914f039560

image/test/reftest/gif/reftest.list

@@ -17,7 +17,7 @@
 random == delaytest.html?transparent-animation.gif transparent-animation-finalframe.gif # incorrect timing dependence (bug 558678)
 
 # test for bug 641198
-skip-if(B2G) random-if(Android) == test_bug641198.html animation2a-finalframe.gif # bug 773482
+skip == test_bug641198.html animation2a-finalframe.gif  # Disabled; see bug 1120144.
 
 # Bug 1062886: a gif with a single color and an offset
 == one-color-offset.gif one-color-offset-ref.gif