Cleanup namespace usage in platform/fonts/.

Source/platform/fonts/win/FontCacheSkiaWin.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Computer, Inc.
  * Copyright (c) 2006, 2007, 2008, 2009, 2012 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.
@@ skipping 233 matching lines @@
         FamilyMinSize entry = minAntiAliasSizeForFont[i];
         if (typefacesMatchesFamily(tf.get(), entry.family)) {
             result->setMinSizeForAntiAlias(entry.minSize);
             break;
         }
     }
 
     return result;
 }
 
-}
+} // namespace blink