Cleanup namespace usage in platform/fonts/.

Source/platform/fonts/skia/FontCustomPlatformDataSkia.cpp

 /*
  * Copyright (C) 2007 Apple Computer, Inc.
  * Copyright (c) 2007, 2008, 2009, Google Inc. All rights reserved.
  * Copyright (C) 2010 Company 100, Inc.
  *
  * 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
@@ skipping 96 matching lines @@
         return nullptr;
 
     return adoptPtr(new FontCustomPlatformData(typeface.release()));
 }
 
 bool FontCustomPlatformData::supportsFormat(const String& format)
 {
     return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype") || OpenTypeSanitizer::supportsFormat(format);
 }
 
-}
+} // namespace blink