[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/argument_spec_builder.h

 // Copyright 2017 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_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>
 #include <vector>
 
 #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 {
 
 // A utility class for helping construct ArgumentSpecs in tests.
 // NOTE: This is designed to be test-only. It's not worth adding to production
 // code because it's a) only a bit of syntactic sugar and b) rife with footguns.
 class ArgumentSpecBuilder {
  public:
   explicit ArgumentSpecBuilder(ArgumentType type);
   ArgumentSpecBuilder(ArgumentType type, base::StringPiece name);
@@ skipping 15 matching lines @@
 
  private:
   std::unique_ptr<ArgumentSpec> spec_;
   ArgumentSpec::PropertiesMap properties_;
 
   DISALLOW_COPY_AND_ASSIGN(ArgumentSpecBuilder);
 };
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_ARGUMENT_SPEC_BUILDER_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_ARGUMENT_SPEC_BUILDER_H_