content: Cleanup class/struct forward declarations

content/browser/frame_host/navigator_delegate.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_NAVIGATOR_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "content/public/browser/navigation_ui_data.h"
 #include "content/public/browser/reload_type.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
 
 class GURL;
 struct FrameHostMsg_DidCommitProvisionalLoad_Params;
-struct FrameHostMsg_DidFailProvisionalLoadWithError_Params;
 
 namespace content {
 
 class FrameTreeNode;
 class NavigationHandle;
 class RenderFrameHostImpl;
 struct LoadCommittedDetails;
 struct OpenURLParams;
 
 // A delegate API used by Navigator to notify its embedder of navigation
@@ skipping 116 matching lines @@
   // wants to see passed to the corresponding URLRequest on the IO thread.
   // In the case of a navigation to an interstitial, no call will be made to the
   // embedder and |nullptr| is returned.
   virtual std::unique_ptr<NavigationUIData> GetNavigationUIData(
       NavigationHandle* navigation_handle);
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_