Bug 640997 - Always update the viewport size, even if it appears unchanged [r=mfinkle, a=blocking]

--HG--
extra : rebase_source : 885b5d22bfcf661a7e5e0b8a7a865c8511daf13b

mobile/chrome/content/browser.js

@@ -2499,9 +2499,7 @@ Tab.prototype = {
         viewportH = Math.max(viewportH, screenH * (browser.contentDocumentWidth / screenW));
       }
     }
-
-    if (browser.contentWindowWidth != viewportW || browser.contentWindowHeight != viewportH)
-      browser.setWindowSize(viewportW, viewportH);
+    browser.setWindowSize(viewportW, viewportH);
   },
 
   restoreViewportPosition: function restoreViewportPosition(aOldWidth, aNewWidth) {