Bug 1185747 part 1 - Use pref/meta-viewport tag instead of DOMWindowUtils to set the CSS viewport for mochitests. r=tn

--HG--
extra : commitid : 4z3MImH4xGx

dom/tests/mochitest/dom-level0/innerWidthHeight_script.html

@@ -6,11 +6,6 @@
   <script class="testbody" type="text/javascript">
   function runSubTest()
   {
-    // Firefox doesn't support the metaviewport tag on desktop, so we force
-    // css viewport here using nsIDomWindowUtils
-    var cwu = SpecialPowers.getDOMWindowUtils(window);
-    cwu.setCSSViewport(320, 320);
-
     var oldWidth = window.innerWidth;
     var oldHeight = window.innerHeight;
 

dom/tests/mochitest/dom-level0/test_innerWidthHeight_script.html

@@ -23,7 +23,8 @@
   }
 
   function startTest() {
-    SpecialPowers.pushPrefEnv({"set": [["dom.disable_window_move_resize", false]]}, runTest);
+    SpecialPowers.pushPrefEnv({"set": [["dom.disable_window_move_resize", false],
+                                       ["dom.meta-viewport.enabled",      true ]]}, runTest);
   }
   </script>
 </body>