Update the URL if the user cancels a beforeunload handler.

content/browser/renderer_host/render_view_host.cc

 // 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.
 
 #include "content/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1307 matching lines @@
     return;
 
   is_waiting_for_beforeunload_ack_ = false;
 
   RenderViewHostDelegate::RendererManagement* management_delegate =
       delegate_->GetRendererManagementDelegate();
   if (management_delegate) {
     management_delegate->ShouldClosePage(
         unload_ack_is_for_cross_site_transition_, proceed);
   }
+
+  // If canceled, notify the delegate to cancel its pending navigation entry.
+  if (!proceed)
+    delegate_->DidCancelLoading();
 }
 
 void RenderViewHost::WindowMoveOrResizeStarted() {
   Send(new ViewMsg_MoveOrResizeStarted(routing_id()));
 }
 
 void RenderViewHost::NotifyRendererUnresponsive() {
   delegate_->RendererUnresponsive(
       this, is_waiting_for_beforeunload_ack_ || is_waiting_for_unload_ack_);
 }
@@ skipping 281 matching lines @@
     LOG(DFATAL) << "Invalid checked state " << checked_state;
     return;
   }
 
   CommandState state;
   state.is_enabled = is_enabled;
   state.checked_state =
       static_cast<RenderViewCommandCheckedState>(checked_state);
   command_states_[static_cast<RenderViewCommand>(command)] = state;
 }