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

android_webview/native/aw_contents_client_bridge.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_NATIVE_AW_CONTENTS_CLIENT_BRIDGE_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_CLIENT_BRIDGE_H_
 
 #include <jni.h>
 
 #include "android_webview/browser/aw_contents_client_bridge_base.h"
@@ skipping 33 matching lines @@
 
   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)
       override;
   void RunBeforeUnloadDialog(
       const GURL& origin_url,
-      const base::string16& message_text,
       const content::JavaScriptDialogManager::DialogClosedCallback& callback)
       override;
   bool ShouldOverrideUrlLoading(const base::string16& url,
                                 bool has_user_gesture,
                                 bool is_redirect,
                                 bool is_main_frame) override;
 
   // Methods called from Java.
   void ProceedSslError(JNIEnv* env,
                        const base::android::JavaRef<jobject>& obj,
@@ skipping 24 matching lines @@
   // doesn't provide Release, so ownership is managed manually.
   IDMap<content::ClientCertificateDelegate>
       pending_client_cert_request_delegates_;
 };
 
 bool RegisterAwContentsClientBridge(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_CLIENT_BRIDGE_H_