Move TabStripModelDelegate off Browser into its own class.

chrome/browser/ui/tabs/tab_strip_model_delegate.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_DELEGATE_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_DELEGATE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 24 matching lines @@
 //  the TabStripModel (in our case the Browser object).
 //
 ///////////////////////////////////////////////////////////////////////////////
 class TabStripModelDelegate {
  public:
   enum {
     TAB_MOVE_ACTION = 1,
     TAB_TEAROFF_ACTION = 2
   };
 
+  virtual ~TabStripModelDelegate() {}
+
   // Adds what the delegate considers to be a blank tab to the model.
   virtual TabContents* AddBlankTab(bool foreground) = 0;
   virtual TabContents* AddBlankTabAt(int index, bool foreground) = 0;
 
   // Asks for a new TabStripModel to be created and the given tab contents to
   // be added to it. Its size and position are reflected in |window_bounds|.
   // If |dock_info|'s type is other than NONE, the newly created window should
   // be docked as identified by |dock_info|. Returns the Browser object
   // representing the newly created window and tab strip. This does not
   // show the window, it's up to the caller to do so.
@@ skipping 45 matching lines @@
 
   // Restores the last closed tab if CanRestoreTab would return true.
   virtual void RestoreTab() = 0;
 
   // Returns true if we should allow "bookmark all tabs" in this window; this is
   // true when there is more than one bookmarkable tab open.
   virtual bool CanBookmarkAllTabs() const = 0;
 
   // Creates a bookmark folder containing a bookmark for all open tabs.
   virtual void BookmarkAllTabs() = 0;
-
- protected:
-  virtual ~TabStripModelDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_DELEGATE_H_