GTTF: Add missing virtual destructors.

chrome/browser/managed_mode/managed_mode_url_filter.h

 // Copyright (c) 2012 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_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_
 #define CHROME_BROWSER_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 21 matching lines @@
  public:
   enum FilteringBehavior {
     ALLOW,
     WARN,
     BLOCK,
     HISTOGRAM_BOUNDING_VALUE
   };
 
   class Observer {
    public:
+    virtual ~Observer() { }
+
     virtual void OnSiteListUpdated() = 0;
   };
 
   struct Contents;
 
   ManagedModeURLFilter();
 
   static FilteringBehavior BehaviorFromInt(int behavior_value);
 
   void GetSites(const GURL& url,
@@ skipping 41 matching lines @@
   // The |url_manual_list_allow_| blocks all URLs except the ones that are
   // added while the |url_manual_list_block_| blocks only the URLs that are
   // added to it.
   scoped_ptr<policy::URLBlacklist> url_manual_list_allow_;
   scoped_ptr<policy::URLBlacklist> url_manual_list_block_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagedModeURLFilter);
 };
 
 #endif  // CHROME_BROWSER_MANAGED_MODE_MANAGED_MODE_URL_FILTER_H_