Cleanup namespace usage in platform/fonts/.

Source/platform/fonts/FontFeatureSettings.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 46 matching lines @@
     void append(const FontFeature& feature) { m_list.append(feature); }
     size_t size() const { return m_list.size(); }
     const FontFeature& operator[](int index) const { return m_list[index]; }
     const FontFeature& at(size_t index) const { return m_list.at(index); }
 
 private:
     FontFeatureSettings();
     Vector<FontFeature> m_list;
 };
 
-}
+} // namespace blink
 
 #endif // FontFeatureSettings_h