[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/argument_spec_builder.h

Index: extensions/renderer/bindings/argument_spec_builder.h
diff --git a/extensions/renderer/argument_spec_builder.h b/extensions/renderer/bindings/argument_spec_builder.h
similarity index 86%
rename from extensions/renderer/argument_spec_builder.h
rename to extensions/renderer/bindings/argument_spec_builder.h
index 0f0b8760c60c1c8c8f73ded46f02db3eebb4cc94..e0737c956d5fe9f4a1b1e1366d5fc65bba54a4e8 100644
--- a/extensions/renderer/argument_spec_builder.h
+++ b/extensions/renderer/bindings/argument_spec_builder.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_ARGUMENT_SPEC_BUILDER_H_
-#define EXTENSIONS_RENDERER_ARGUMENT_SPEC_BUILDER_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_ARGUMENT_SPEC_BUILDER_H_
+#define EXTENSIONS_RENDERER_BINDINGS_ARGUMENT_SPEC_BUILDER_H_
 
 #include <memory>
 #include <set>
@@ -11,7 +11,7 @@
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
-#include "extensions/renderer/argument_spec.h"
+#include "extensions/renderer/bindings/argument_spec.h"
 
 namespace extensions {
 
@@ -47,4 +47,4 @@ class ArgumentSpecBuilder {
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_ARGUMENT_SPEC_BUILDER_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_ARGUMENT_SPEC_BUILDER_H_