FBTF: Fix more ctor/dtors found by clang plugin.

chrome/browser/extensions/default_apps.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
 #define CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 19 matching lines @@
 // The promo can also be forced on with --force-apps-promo-visible.
 class DefaultApps {
  public:
   // The maximum number of times to show the apps promo.
   static const int kAppsPromoCounterMax;
 
   // Register our preferences.
   static void RegisterUserPrefs(PrefService* prefs);
 
   explicit DefaultApps(PrefService* prefs);
+  ~DefaultApps();
 
   // Gets the list of default apps that should be installed. Can return NULL if
   // no apps need to be installed.
   const ExtensionIdSet* GetAppsToInstall() const;
 
   // Should be called after each app is installed. Once installed_ids contains
   // all the default apps, GetAppsToInstall() will start returning NULL.
   void DidInstallApp(const ExtensionIdSet& installed_ids);
 
   // Returns true if the apps promo should be displayed in the launcher. This
@@ skipping 24 matching lines @@
   PrefService* prefs_;
 
   // The set of default extensions. Initialized to a static list in the
   // constructor.
   ExtensionIdSet ids_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultApps);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_