color-profile-reflection: try using one level of runAfterLayoutAndPaint

Test is using two levels of runAfterLayoutAndPaint and is failing on
the some bots (see bug 713049).

Try using one runAfterLayoutAndPaint since that's all that should be
needed after changing the element box-reflection CSS style.

Bug: 713049
Change-Id: I448b6908044786cb9da45945b2aed370336c1353
Reviewed-on: https://chromium-review.googlesource.com/558540Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485101}

third_party/WebKit/LayoutTests/images/color-profile-reflection.html

@@ -27,8 +27,7 @@ window.onload = function() {
 };
 
 function done() {
-  runAfterLayoutAndPaint(function() { testRunner.notifyDone() });
+  window.testRunner.notifyDone();
 }
-
 </script>
 </html>