[Extensions] Simplify EventFilteringInfo

extensions/renderer/api_event_handler.h

 // Copyright 2016 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_API_EVENT_HANDLER_H_
 #define EXTENSIONS_RENDERER_API_EVENT_HANDLER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "extensions/common/event_filter.h"
 #include "extensions/renderer/api_binding_types.h"
 #include "extensions/renderer/event_emitter.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
-class EventFilteringInfo;
+struct EventFilteringInfo;
 
 // The object to handle API events. This includes vending v8::Objects for the
 // event; handling adding, removing, and querying listeners; and firing events
 // to subscribed listeners. Designed to be used across JS contexts, but on a
 // single thread.
 class APIEventHandler {
  public:
   // The callback to be called when event listeners change. |was_manual|
   // indicates that the change was due to an extension calling addListener or
   // removeListener, rather than through something like context destruction.
@@ skipping 70 matching lines @@
 
   // The associated EventFilter; shared across all contexts and events.
   EventFilter event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(APIEventHandler);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_EVENT_HANDLER_H_