Fixed ChromeOS clang build.

chrome/browser/ui/views/crypto_module_password_dialog_view.h

 // Copyright (c) 2011 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_VIEWS_CRYPTO_MODULE_PASSWORD_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_CRYPTO_MODULE_PASSWORD_DIALOG_VIEW_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 21 matching lines @@
       const std::string& slot_name,
       browser::CryptoModulePasswordReason reason,
       const std::string& server,
       const base::Callback<void(const char*)>& callback);
 
   virtual ~CryptoModulePasswordDialogView();
 
   // views::DialogDelegate:
   virtual bool Accept() OVERRIDE;
   virtual bool Cancel() OVERRIDE;
-  string16 GetDialogButtonLabel(
+  virtual string16 GetDialogButtonLabel(
       ui::DialogButton button) const OVERRIDE;
 
 
   // views::WidgetDelegate:
   virtual views::View* GetInitiallyFocusedView() OVERRIDE;
   virtual bool IsModal() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
 
   // views::View:
   virtual string16 GetWindowTitle() const OVERRIDE;
@@ skipping 17 matching lines @@
 
   const base::Callback<void(const char*)> callback_;
   FRIEND_TEST_ALL_PREFIXES(CryptoModulePasswordDialogViewTest, TestAccept);
 
   DISALLOW_COPY_AND_ASSIGN(CryptoModulePasswordDialogView);
 };
 
 }  // namespace browser
 
 #endif  // CHROME_BROWSER_UI_VIEWS_CRYPTO_MODULE_PASSWORD_DIALOG_VIEW_H_