[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding_hooks_test_delegate.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_API_BINDING_HOOKS_TEST_DELEGATE_H_
-#define EXTENSIONS_RENDERER_API_BINDING_HOOKS_TEST_DELEGATE_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_BINDING_HOOKS_TEST_DELEGATE_H_
+#define EXTENSIONS_RENDERER_BINDINGS_API_BINDING_HOOKS_TEST_DELEGATE_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
-#include "extensions/renderer/api_binding_hooks_delegate.h"
-#include "extensions/renderer/api_binding_types.h"
+#include "extensions/renderer/bindings/api_binding_hooks_delegate.h"
+#include "extensions/renderer/bindings/api_binding_types.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 // A test class to simply adding custom events or handlers for API hooks.
 class APIBindingHooksTestDelegate : public APIBindingHooksDelegate {
  public:
   APIBindingHooksTestDelegate();
   ~APIBindingHooksTestDelegate() override;
 
@@ skipping 38 matching lines @@
  private:
   std::map<std::string, RequestHandler> request_handlers_;
   CustomEventFactory custom_event_;
   TemplateInitializer template_initializer_;
 
   DISALLOW_COPY_AND_ASSIGN(APIBindingHooksTestDelegate);
 };
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_API_BINDING_HOOKS_TEST_DELEGATE_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDING_HOOKS_TEST_DELEGATE_H_