Don't proxy methods through overview; add a getWorkspacesForWindow()

Duplicating the methods was unnecessary.  Also, we want a getWorkspacesForWindow()
method as preparation for multi-monitor work.

https://bugzilla.gnome.org/show_bug.cgi?id=594699

js/ui/overview.js

@@ -386,6 +386,18 @@ Overview.prototype = {
             this.show();
     },
 
+    /**
+     * getWorkspacesForWindow:
+     * @metaWindow: A #MetaWindow
+     *
+     * Returns the Workspaces object associated with the given window.
+     * This method is not be accessible if the overview is not open
+     * and will return %null.
+     */
+    getWorkspacesForWindow: function(metaWindow) {
+        return this._workspaces;
+    },
+
     /**
      * activateWindow:
      * @metaWindow: A #MetaWindow
@@ -401,31 +413,6 @@ Overview.prototype = {
          this.hide();
     },
 
-    /**
-     * setHighlightWindow:
-     * @metaWindow: A #MetaWindow
-     *
-     * Draw the user's attention to the given window @metaWindow.
-     */
-    setHighlightWindow: function (metaWindow) {
-        if (this._workspaces)
-            this._workspaces.setHighlightWindow(metaWindow);
-    },
-
-
-    /**
-     * setApplicationWindowSelection:
-     * @appid: Application identifier string
-     *
-     * Enter a mode which shows only the windows owned by the
-     * given application, and allow highlighting of a specific
-     * window with setHighlightWindow().
-     */
-    setApplicationWindowSelection: function (appid) {
-        if (this._workspaces)
-            this._workspaces.setApplicationWindowSelection(appid);
-    },
-
     //// Private methods ////
 
     _showDone: function() {