bug 921011 fix nsIBrowserDOMWindow in chat window, r=felipe

browser/base/content/chatWindow.xul

@@ -63,6 +63,9 @@ var gChatWindow = {
       document.getElementById(disabledItem).setAttribute("disabled", "true");
     }
 
+    window.QueryInterface(Ci.nsIDOMChromeWindow).browserDOMWindow =
+      new chatBrowserAccess();
+
     // initialise the offline listener
     BrowserOffline.init();
   },
@@ -72,9 +75,6 @@ var gChatWindow = {
   }
 }
 
-__defineGetter__("content", function()
-  document.getElementById("chatter").contentWindow);
-
 // define a popupnotifications handler for this window.  we don't use
 // an iconbox here, and only support the browser frame for chat.
 XPCOMUtils.defineLazyGetter(this, "PopupNotifications", function () {
@@ -90,6 +90,49 @@ XPCOMUtils.defineLazyGetter(this, "PopupNotifications", function () {
   }
 });
 
+XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
+                                  "resource:///modules/RecentWindow.jsm");
+
+function chatBrowserAccess() { }
+
+chatBrowserAccess.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIBrowserDOMWindow, Ci.nsISupports]),
+
+  _openURIInNewTab: function(aURI, aWhere) {
+    if (aWhere != Ci.nsIBrowserDOMWindow.OPEN_NEWTAB)
+      return null;
+
+    let win = RecentWindow.getMostRecentBrowserWindow();
+    if (!win) {
+      // We couldn't find a suitable window, a new one needs to be opened.
+      return null;
+    }
+
+    let loadInBackground =
+      Services.prefs.getBoolPref("browser.tabs.loadDivertedInBackground");
+    let tab = win.gBrowser.loadOneTab(aURI ? aURI.spec : "about:blank",
+                                      {inBackground: loadInBackground});
+    let browser = win.gBrowser.getBrowserForTab(tab);
+    win.focus();
+
+    return browser;
+  },
+
+  openURI: function (aURI, aOpener, aWhere, aContext) {
+    let browser = this._openURIInNewTab(aURI, aWhere);
+    return browser ? browser.contentWindow : null;
+  },
+
+  openURIInFrame: function browser_openURIInFrame(aURI, aOpener, aWhere, aContext) {
+    let browser = this._openURIInNewTab(aURI, aWhere);
+    return browser ? browser.QueryInterface(Ci.nsIFrameLoaderOwner) : null;
+  },
+
+  isTabContentWindow: function (aWindow) this.contentWindow == aWindow,
+
+  get contentWindow() document.getElementById("chatter").contentWindow
+};
+
 </script>
 
 #include browser-sets.inc