[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_last_error.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_LAST_ERROR_H_
-#define EXTENSIONS_RENDERER_API_LAST_ERROR_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_LAST_ERROR_H_
+#define EXTENSIONS_RENDERER_BINDINGS_API_LAST_ERROR_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 
 // Handles creating and clearing a 'lastError' property to hold the last error
@@ skipping 26 matching lines @@
  private:
   GetParent get_parent_;
 
   AddConsoleError add_console_error_;
 
   DISALLOW_COPY_AND_ASSIGN(APILastError);
 };
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_API_LAST_ERROR_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_LAST_ERROR_H_