[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding.h

Index: extensions/renderer/bindings/api_binding.h
diff --git a/extensions/renderer/api_binding.h b/extensions/renderer/bindings/api_binding.h
similarity index 96%
rename from extensions/renderer/api_binding.h
rename to extensions/renderer/bindings/api_binding.h
index 8cd3e81942388debab461a3866302f7776278dce..3412e6e2133c6be1e54eb502fdd707a8e63bcbbd 100644
--- a/extensions/renderer/api_binding.h
+++ b/extensions/renderer/bindings/api_binding.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXTENSIONS_RENDERER_API_BINDING_H_
-#define EXTENSIONS_RENDERER_API_BINDING_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_
+#define EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_
 
 #include <map>
 #include <memory>
@@ -13,7 +13,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/supports_user_data.h"
-#include "extensions/renderer/argument_spec.h"
+#include "extensions/renderer/bindings/argument_spec.h"
 #include "v8/include/v8.h"
 
 namespace base {
@@ -160,4 +160,4 @@ class APIBinding {
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_API_BINDING_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDING_H_