Clean-up coding style

extensions/common/features/json_feature_provider_source.h

 // Copyright 2014 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_COMMON_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_
-#define EXTENSIONS_COMMON_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_
+#ifndef EXTENSIONS_COMMON_FEATURES_JSON_FEATURE_PROVIDER_SOURCE_H_
+#define EXTENSIONS_COMMON_FEATURES_JSON_FEATURE_PROVIDER_SOURCE_H_
+
+#include <string>
 
 #include "base/values.h"
 
 namespace extensions {
 
 // A JSONFeatureProviderSource loads JSON dictionary files that
 // define features.
 class JSONFeatureProviderSource {
  public:
   explicit JSONFeatureProviderSource(const std::string& name);
@@ skipping 10 matching lines @@
   // The name of this feature type; only used for debugging.
   const std::string name_;
 
   base::DictionaryValue dictionary_;
 
   DISALLOW_COPY_AND_ASSIGN(JSONFeatureProviderSource);
 };
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_COMMON_FEATURE_JSON_FEATURE_PROVIDER_SOURCE_H_
+#endif  // EXTENSIONS_COMMON_FEATURES_JSON_FEATURE_PROVIDER_SOURCE_H_