extensions: Cleanup class/struct fwd declarations

extensions/renderer/guest_view/guest_view_internal_custom_bindings.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
 
 #include <map>
 
 #include "extensions/renderer/object_backed_native_handler.h"
 
 namespace extensions {
-class Dispatcher;
 
 // Implements custom bindings for the guestViewInternal API.
 class GuestViewInternalCustomBindings : public ObjectBackedNativeHandler {
  public:
   explicit GuestViewInternalCustomBindings(ScriptContext* context);
   ~GuestViewInternalCustomBindings() override;
 
  private:
   // ResetMapEntry is called as a callback to SetWeak(). It resets the
   // weak view reference held in |view_map_|.
@@ skipping 65 matching lines @@
   // Note that the guest requesting fullscreen means it has already been
   // triggered by a user gesture and we get to this point if embedder allows
   // the fullscreen request to proceed.
   void RunWithGesture(
       const v8::FunctionCallbackInfo<v8::Value>& args);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_GUEST_VIEW_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_