[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/event_emitter.h

Index: extensions/renderer/bindings/event_emitter.h
diff --git a/extensions/renderer/event_emitter.h b/extensions/renderer/bindings/event_emitter.h
similarity index 92%
rename from extensions/renderer/event_emitter.h
rename to extensions/renderer/bindings/event_emitter.h
index bcd8208f576fc20ca7da25ef4650bf16d40a5c3e..9f9cbe5e7fa66c1436d278a7571174805cc45316 100644
--- a/extensions/renderer/event_emitter.h
+++ b/extensions/renderer/bindings/event_emitter.h
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXTENSIONS_RENDERER_EVENT_EMITTER_H_
-#define EXTENSIONS_RENDERER_EVENT_EMITTER_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_EVENT_EMITTER_H_
+#define EXTENSIONS_RENDERER_BINDINGS_EVENT_EMITTER_H_
 
 #include <vector>
 
-#include "extensions/renderer/api_binding_types.h"
+#include "extensions/renderer/bindings/api_binding_types.h"
 #include "gin/wrappable.h"
 #include "v8/include/v8.h"
 
@@ -82,4 +82,4 @@ class EventEmitter final : public gin::Wrappable<EventEmitter> {
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_EVENT_EMITTER_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_EVENT_EMITTER_H_