Remove the ability of webpages to specify strings for the onbeforeunload dialog.

android_webview/browser/aw_contents_client_bridge_base.h

 // Copyright (c) 2013 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 ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_CLIENT_BRIDGE_BASE_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_CLIENT_BRIDGE_BASE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/public/browser/javascript_dialog_manager.h"
@@ skipping 41 matching lines @@
   virtual void RunJavaScriptDialog(
       content::JavaScriptMessageType message_type,
       const GURL& origin_url,
       const base::string16& message_text,
       const base::string16& default_prompt_text,
       const content::JavaScriptDialogManager::DialogClosedCallback& callback)
       = 0;
 
   virtual void RunBeforeUnloadDialog(
       const GURL& origin_url,
-      const base::string16& message_text,
       const content::JavaScriptDialogManager::DialogClosedCallback& callback)
       = 0;
 
   virtual bool ShouldOverrideUrlLoading(const base::string16& url,
                                         bool has_user_gesture,
                                         bool is_redirect,
                                         bool is_main_frame) = 0;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_CONTENTS_CLIENT_BRIDGE_BASE_H_