[Mobile] Override browse behavior

Override browse tree behavior such that tree collapses upon
navigation change in mobile.

platform/commonUI/browse/src/BrowseTreeController.js

@@ -38,14 +38,6 @@ define(
             this.state = !this.state;
         };
 
-        BrowseTreeController.prototype.hide = function () {
-            this.state = false;
-        };
-
-        BrowseTreeController.prototype.show = function () {
-            this.state = true;
-        };
-
         BrowseTreeController.prototype.visible = function () {
             return this.state;
         };