Remove duplicated headers from platform/

Source/platform/SSLKeyGenerator.cpp

 /*
  * Copyright (c) 2008, 2009, 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.
  */
 
 #include "config.h"
 #include "platform/SSLKeyGenerator.h"
 
 #include "platform/text/PlatformLocale.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
-#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 void getSupportedKeySizes(Locale& locale, Vector<String>& sizes)
 {
     sizes.resize(2);
     sizes[0] = locale.queryString(blink::WebLocalizedString::KeygenMenuHighGradeKeySize);
     sizes[1] = locale.queryString(blink::WebLocalizedString::KeygenMenuMediumGradeKeySize);
 }
 
 String signedPublicKeyAndChallengeString(unsigned keySizeIndex, const String& challengeString, const KURL& url)
 {
     return blink::Platform::current()->signedPublicKeyAndChallengeString(keySizeIndex, blink::WebString(challengeString), blink::WebURL(url));
 }
 
 } // namespace WebCore