Bug 472735: optimize about:blank onlocationchange (breakage fix), r=mfinkle

mobile/chrome/content/browser.js

@@ -1046,10 +1046,11 @@ ProgressController.prototype = {
   onLocationChange: function(aWebProgress, aRequest, aLocationURI) {
     // XXX this code is not multiple-tab friendly.
     var location = aLocationURI ? aLocationURI.spec : "";
-    let lastURI = selectedBrowser.lastURI    
+    let selectedBrowser = Browser.selectedBrowser;
+    let lastURI = selectedBrowser.lastURI;
     //don't do anything for about:blank or about:firstrun on first display
     if (!lastURI && (location == "about:blank" || location == "about:firstrun" )) {
-      return
+      return;
     }
 
     this._hostChanged = true;
@@ -1062,7 +1063,6 @@ ProgressController.prototype = {
     // <a href="#" onclick="return install();">Install Foo</a>
     //
     // - which fires a onLocationChange message to uri + '#'...
-    let selectedBrowser = Browser.selectedBrowser;
     selectedBrowser.lastURI = aLocationURI;
     if (lastURI) {
       var oldSpec = lastURI.spec;