Makes BrowserStatusMonitor remove observers in destructor

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

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/ash/launcher/browser_shortcut_launcher_item_controller.h"
 
 #include <vector>
 
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
@@ skipping 254 matching lines @@
   // order.
   const BrowserList* ash_browser_list =
       BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   for (BrowserList::const_iterator it =
            ash_browser_list->begin();
        it != ash_browser_list->end(); ++it) {
     if (IsBrowserRepresentedInBrowserList(*it))
       items.push_back(*it);
   }
   // If there are no suitable browsers we create a new one.
-  if (!items.size()) {
+  if (items.empty()) {
     launcher_controller()->CreateNewWindow();
     return;
   }
   Browser* browser = chrome::FindBrowserWithWindow(ash::wm::GetActiveWindow());
   if (items.size() == 1) {
     // If there is only one suitable browser, we can either activate it, or
     // bounce it (if it is already active).
     if (browser == items[0]) {
       AnimateWindow(browser->window()->GetNativeWindow(),
                     views::corewm::WINDOW_ANIMATION_TYPE_BOUNCE);
       return;
     }
     browser = items[0];
   } else {
     // If there is more then one suitable browser, we advance to the next if
-    // |current_browser| is already active - or - check the last used browser
-    // if it can be used.
+    // |browser| is already active - or - check the last used browser if it can
+    // be used.
     std::vector<Browser*>::iterator i =
         std::find(items.begin(), items.end(), browser);
     if (i != items.end()) {
       browser = (++i == items.end()) ? items[0] : *i;
     } else {
       browser = chrome::FindTabbedBrowser(profile_,
                                           true,
                                           chrome::HOST_DESKTOP_TYPE_ASH);
       if (!browser ||
           !IsBrowserRepresentedInBrowserList(browser))
         browser = items[0];
     }
   }
   DCHECK(browser);
   browser->window()->Show();
   browser->window()->Activate();
 }
 
 bool BrowserShortcutLauncherItemController::IsBrowserRepresentedInBrowserList(
     Browser* browser) {
   return (browser &&
+          browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH &&
           (browser->is_type_tabbed() ||
            !browser->is_app() ||
            !browser->is_type_popup() ||
            launcher_controller()->
                GetLauncherIDForAppID(web_app::GetExtensionIdFromApplicationName(
                    browser->app_name())) <= 0));
 }