Bug 637898 - Update assertion annotations for test_1.html.

accessible/tests/mochitest/editabletext/test_1.html

@@ -20,9 +20,9 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=452161
 
   <script type="application/javascript">
     if (navigator.platform.startsWith("Mac")) {
-      SimpleTest.expectAssertions(0, 3);
+      SimpleTest.expectAssertions(0, 1);
     } else {
-      SimpleTest.expectAssertions(3);
+      SimpleTest.expectAssertions(1);
     }
 
     function addTestEditable(aID, aTestRun, aTrailChar)