A page can't fire dialogs in unload handlers; remove code that handles that case.

content/browser/frame_host/render_frame_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 861 matching lines @@
   // Callback for connection error on the media::mojom::InterfaceFactory client.
   void OnMediaInterfaceFactoryConnectionError();
 
   // Allows tests to disable the swapout event timer to simulate bugs that
   // happen before it fires (to avoid flakiness).
   void DisableSwapOutTimerForTesting();
 
   void OnRendererConnect(const service_manager::ServiceInfo& local_info,
                          const service_manager::ServiceInfo& remote_info);
 
+  void SendJavaScriptDialogReply(IPC::Message* reply_msg,
+                                 bool success,
+                                 const base::string16& user_input);
+
   // Returns ownership of the NavigationHandle associated with a navigation that
   // just committed.
   std::unique_ptr<NavigationHandleImpl> TakeNavigationHandleForCommit(
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params);
 
   // For now, RenderFrameHosts indirectly keep RenderViewHosts alive via a
   // refcount that calls Shutdown when it reaches zero.  This allows each
   // RenderFrameHostManager to just care about RenderFrameHosts, while ensuring
   // we have a RenderViewHost for each RenderFrameHost.
   // TODO(creis): RenderViewHost will eventually go away and be replaced with
@@ skipping 260 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_