Add a WebSpeechSynthesisVoice constructor to the public API.

Source/Platform/chromium/public/WebSpeechSynthesisVoice.h

 /*
  * 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:
  *  * 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "WebString.h"
 
 namespace WebCore {
 class PlatformSpeechSynthesisVoice;
 }
 
 namespace WebKit {
 
 class WebSpeechSynthesisVoice {
 public:
-    WebSpeechSynthesisVoice() { }
+    WEBKIT_EXPORT WebSpeechSynthesisVoice();
     WebSpeechSynthesisVoice(const WebSpeechSynthesisVoice& other) { assign(other); }
     ~WebSpeechSynthesisVoice() { reset(); }
 
     WebSpeechSynthesisVoice& operator=(const WebSpeechSynthesisVoice& other)
     {
         assign(other);
         return *this;
     }
 
     WEBKIT_EXPORT void assign(const WebSpeechSynthesisVoice&);
     WEBKIT_EXPORT void reset();
 
     WEBKIT_EXPORT void setVoiceURI(const WebString&);
     WEBKIT_EXPORT void setName(const WebString&);
     WEBKIT_EXPORT void setLanguage(const WebString&);
     WEBKIT_EXPORT void setIsLocalService(bool);
     WEBKIT_EXPORT void setIsDefault(bool);
 
 #if WEBKIT_IMPLEMENTATION
     operator WTF::PassRefPtr<WebCore::PlatformSpeechSynthesisVoice>() const;
 #endif
 
 private:
     WebPrivatePtr<WebCore::PlatformSpeechSynthesisVoice> m_private;
 };
 
 } // namespace WebKit
 
 #endif // WebSpeechSynthesisVoice_h