[Windows] Clear Browsing Data dialog should not have any button as default action.

chrome/browser/views/clear_browsing_data.h

 // Copyright (c) 2006-2008 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_VIEWS_CLEAR_BROWSING_DATA_H_
 #define CHROME_BROWSER_VIEWS_CLEAR_BROWSING_DATA_H_
 
 #include "app/combobox_model.h"
 #include "chrome/browser/browsing_data_remover.h"
 #include "views/controls/button/button.h"
@@ skipping 33 matching lines @@
   void Init();
 
   // Overridden from views::View:
   virtual gfx::Size GetPreferredSize();
   virtual void Layout();
   void ViewHierarchyChanged(bool is_add,
                             views::View* parent,
                             views::View* child);
 
   // Overridden from views::DialogDelegate:
+  virtual int GetDefaultDialogButton() const;
   virtual std::wstring GetDialogButtonLabel(
       MessageBoxFlags::DialogButton button) const;
   virtual bool IsDialogButtonEnabled(
       MessageBoxFlags::DialogButton button) const;
   virtual bool CanResize() const;
   virtual bool CanMaximize() const;
   virtual bool IsAlwaysOnTop() const;
   virtual bool HasAlwaysOnTopMenu() const;
   virtual bool IsModal() const;
   virtual std::wstring GetWindowTitle() const;
@@ skipping 46 matching lines @@
   Profile* profile_;
 
   // If non-null it means removal is in progress. BrowsingDataRemover takes care
   // of deleting itself when done.
   BrowsingDataRemover* remover_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowsingDataView);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_CLEAR_BROWSING_DATA_H_