Remove stl_util's deletion functions from tab_strip_model, and do other modernization.

chrome/browser/ui/tabs/tab_strip_model.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_UI_TABS_TAB_STRIP_MODEL_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 500 matching lines @@
                              int to_position,
                              bool select_after_move);
 
   // Implementation of MoveSelectedTabsTo. Moves |length| of the selected tabs
   // starting at |start| to |index|. See MoveSelectedTabsTo for more details.
   void MoveSelectedTabsToImpl(int index, size_t start, size_t length);
 
   // Returns true if the tab represented by the specified data has an opener
   // that matches the specified one. If |use_group| is true, then this will
   // fall back to check the group relationship as well.
-  static bool OpenerMatches(const WebContentsData* data,
+  static bool OpenerMatches(const std::unique_ptr<WebContentsData>& data,
                             const content::WebContents* opener,
                             bool use_group);
 
   // Sets the group/opener of any tabs that reference the tab at |index| to that
   // tab's group/opener respectively.
   void FixOpenersAndGroupsReferencing(int index);
 
   // Our delegate.
   TabStripModelDelegate* delegate_;
 
   // The WebContents data currently hosted within this TabStripModel.
-  typedef std::vector<WebContentsData*> WebContentsDataVector;
-  WebContentsDataVector contents_data_;
+  std::vector<std::unique_ptr<WebContentsData>> contents_data_;
 
   // A profile associated with this TabStripModel.
   Profile* profile_;
 
   // True if all tabs are currently being closed via CloseAllTabs.
   bool closing_all_;
 
   // An object that determines where new Tabs should be inserted and where
   // selection should move when a Tab is closed.
   std::unique_ptr<TabStripModelOrderController> order_controller_;
 
   // Our observers.
-  typedef base::ObserverList<TabStripModelObserver> TabStripModelObservers;
-  TabStripModelObservers observers_;
+  base::ObserverList<TabStripModelObserver> observers_;
 
   ui::ListSelectionModel selection_model_;
 
   // TODO(sky): remove this; used for debugging 291265.
   bool in_notify_;
 
   base::WeakPtrFactory<TabStripModel> weak_factory_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TabStripModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_