mash: Cleanup ash shelf application menu code.

chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc
index 55cfb624ee7db245b61276994dd4b6f4cd388096..c217f9c5cfe92c65ab27c020274c05b3ad84346b 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.cc
@@ -16,10 +16,8 @@
 ChromeLauncherAppMenuItemBrowser::ChromeLauncherAppMenuItemBrowser(
     const base::string16 title,
     const gfx::Image* icon,
-    Browser* browser,
-    bool has_leading_separator)
-    : ChromeLauncherAppMenuItem(title, icon, has_leading_separator),
-      browser_(browser) {
+    Browser* browser)
+    : ash::ShelfApplicationMenuItem(title, icon), browser_(browser) {
   DCHECK(browser);
   registrar_.Add(this,
                  chrome::NOTIFICATION_BROWSER_CLOSING,
@@ -28,10 +26,6 @@ ChromeLauncherAppMenuItemBrowser::ChromeLauncherAppMenuItemBrowser(
 
 ChromeLauncherAppMenuItemBrowser::~ChromeLauncherAppMenuItemBrowser() {}
 
-bool ChromeLauncherAppMenuItemBrowser::IsEnabled() const {
-  return true;
-}
-
 void ChromeLauncherAppMenuItemBrowser::Execute(int event_flags) {
   if (browser_) {
     if (event_flags & (ui::EF_SHIFT_DOWN | ui::EF_MIDDLE_MOUSE_BUTTON)) {