Rename WebCore namespace to blink in Platform

Source/platform/network/DNS.h

 /*
  * Copyright (C) 2008 Collin Jackson  <collinj@webkit.org>
  * Copyright (C) 2013 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
@@ skipping 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DNS_h
 #define DNS_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
 
-namespace WebCore {
+namespace blink {
 
 PLATFORM_EXPORT void prefetchDNS(const String& hostname);
 
-} // namespace WebCore
+} // namespace blink
 
 #endif