Backed out changeset 2a41319f21a8 (bug 681138) for making the failures much more frequent.

layout/base/tests/test_reftests_with_caret.html

@@ -52,7 +52,7 @@ function remotePageLoaded(callback) {
   setTimeout(function(){
     doSnapShot(iframe);
     callback();
-  }, 100);
+  }, 0);
 };
 
 const MAX_ITERATIONS = 1000;