Rename WebCore namespace to blink in Platform

Source/platform/fonts/FontCacheClient.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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FontCacheClient_h
 #define FontCacheClient_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 
-namespace WebCore {
+namespace blink {
 
 class PLATFORM_EXPORT FontCacheClient : public RefCountedWillBeGarbageCollectedFinalized<FontCacheClient> {
 public:
     virtual ~FontCacheClient() { }
 
     virtual void fontCacheInvalidated() = 0;
     virtual void trace(Visitor*) { }
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // FontCacheClient_h