Cleanup namespace usage in platform/fonts/.

Source/platform/fonts/FontPlatformFeatures.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 
 class FontPlatformFeatures {
 public:
     static bool canReturnFallbackFontsForComplexText();
     static bool canExpandAroundIdeographsInComplexText();
 
 private:
     FontPlatformFeatures();
 };
 
-}
+} // namespace blink
 
 #endif