Bug 750159 - Sometimes we get 'browser is null' errors in onLocationChange so remove the need for the browser r=mbrubeck

mobile/android/chrome/content/browser.js

@@ -2208,15 +2208,10 @@ Tab.prototype = {
     if (contentWin != contentWin.top)
         return;
 
-    let browser = BrowserApp.getBrowserForWindow(contentWin);
-    let uri = browser.currentURI.spec;
-    let documentURI = "";
-    let contentType = "";
+    let uri = aLocationURI.spec;
+    let documentURI = contentWin.document.documentURIObject.spec;
+    let contentType = contentWin.document.contentType;
     let sameDocument = (aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT) != 0;
-    if (browser.contentDocument) {
-      documentURI = browser.contentDocument.documentURIObject.spec;
-      contentType = browser.contentDocument.contentType;
-    }
 
     // Reset state of click-to-play plugin notifications.
     this.clickToPlayPluginDoorhangerShown = false;