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

content/renderer/render_frame_impl.cc

 // Copyright 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.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 3609 matching lines @@
   bool ok = RunJavaScriptMessage(JAVASCRIPT_MESSAGE_TYPE_PROMPT,
                                  message,
                                  default_value,
                                  frame_->document().url(),
                                  &result);
   if (ok)
     actual_value->assign(result);
   return ok;
 }
 
-bool RenderFrameImpl::runModalBeforeUnloadDialog(
-    bool is_reload,
-    const blink::WebString& message) {
+bool RenderFrameImpl::runModalBeforeUnloadDialog(bool is_reload) {
   // If we are swapping out, we have already run the beforeunload handler.
   // TODO(creis): Fix OnSwapOut to clear the frame without running beforeunload
   // at all, to avoid running it twice.
   if (is_swapped_out_)
     return true;
 
   // Don't allow further dialogs if we are waiting to swap out, since the
   // PageGroupLoadDeferrer in our stack prevents it.
   if (render_view()->suppress_dialogs_until_swap_out_)
     return false;
 
   bool success = false;
   // This is an ignored return value, but is included so we can accept the same
   // response as RunJavaScriptMessage.
   base::string16 ignored_result;
   render_view()->SendAndRunNestedMessageLoop(
       new FrameHostMsg_RunBeforeUnloadConfirm(
-          routing_id_, frame_->document().url(), message, is_reload,
+          routing_id_, frame_->document().url(), is_reload,
           &success, &ignored_result));
   return success;
 }
 
 void RenderFrameImpl::showContextMenu(const blink::WebContextMenuData& data) {
   ContextMenuParams params = ContextMenuParamsBuilder::Build(data);
   blink::WebRect position_in_window(params.x, params.y, 0, 0);
   GetRenderWidget()->convertViewportToWindow(&position_in_window);
   params.x = position_in_window.x;
   params.y = position_in_window.y;
@@ skipping 2471 matching lines @@
                                     int match_count,
                                     int ordinal,
                                     const WebRect& selection_rect,
                                     bool final_status_update) {
   Send(new FrameHostMsg_Find_Reply(routing_id_, request_id, match_count,
                                    selection_rect, ordinal,
                                    final_status_update));
 }
 
 }  // namespace content