Bug 890193 followup. Annotate the assertions it causes so we can reopen the CLOSED TREE.

dom/tests/mochitest/dom-level1-core/test_nodeappendchildchildexists.html

@@ -74,6 +74,7 @@ var docName = 'nodeappendchildchildexists';
 
 
 window.doc = window;  
+SimpleTest.expectAssertions(1); // Bug 892638
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(setUpPage);
 

dom/tests/mochitest/dom-level1-core/test_nodeinsertbeforenewchildexists.html

@@ -74,6 +74,7 @@ var docName = 'nodeinsertbeforenewchildexists';
 
 
 window.doc = window;  
+SimpleTest.expectAssertions(1); // Bug 892638
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(setUpPage);
 

dom/tests/mochitest/dom-level1-core/test_nodereplacechildnewchildexists.html

@@ -74,6 +74,7 @@ var docName = 'nodereplacechildnewchildexists';
 
 
 window.doc = window;  
+SimpleTest.expectAssertions(1); // Bug 892638
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(setUpPage);