[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_invocation_errors.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_INVOCATION_ERRORS_H_
-#define EXTENSIONS_RENDERER_API_INVOCATION_ERRORS_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_INVOCATION_ERRORS_H_
+#define EXTENSIONS_RENDERER_BINDINGS_API_INVOCATION_ERRORS_H_
 
 #include <set>
 #include <string>
 
 #include "base/strings/string_piece.h"
 
 // A collection of error-related strings and utilities for parsing API
 // invocations.
 namespace extensions {
 namespace api_errors {
@@ skipping 45 matching lines @@
 
 // Returns a message indicating that an API method was called with an invalid
 // signature.
 std::string InvocationError(const std::string& method_name,
                             const std::string& expected_signature,
                             const std::string& error);
 
 }  // namespace api_errors
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_API_INVOCATION_ERRORS_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_INVOCATION_ERRORS_H_