[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/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_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_EVENT_HANDLER_H_
+#define EXTENSIONS_RENDERER_BINDINGS_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 "extensions/renderer/bindings/api_binding_types.h"
+#include "extensions/renderer/bindings/event_emitter.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace extensions {
 struct EventFilteringInfo;
 
 // The object to handle API events. This includes vending v8::Objects for the
@@ skipping 77 matching lines @@
   EventListenersChangedMethod listeners_changed_;
 
   // 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_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_EVENT_HANDLER_H_