Add a CustomSchemeHandler runtime flag to remove ENABLE(CUSTOM_SCHEME_HANDLER)

Source/modules/navigatorcontentutils/NavigatorContentUtilsClient.h

 /*
  * Copyright (C) 2012 Samsung Electronics. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 
 namespace WebCore {
 
 class Page;
 
 class NavigatorContentUtilsClient {
 public:
     virtual ~NavigatorContentUtilsClient() { }
     virtual void registerProtocolHandler(const String& scheme, const String& baseURL, const String& url, const String& title) = 0;
 
-#if ENABLE(CUSTOM_SCHEME_HANDLER)
     enum CustomHandlersState {
         CustomHandlersNew,
         CustomHandlersRegistered,
         CustomHandlersDeclined
     };
 
     virtual CustomHandlersState isProtocolHandlerRegistered(const String& scheme, const String& baseURL, const String& url) = 0;
     virtual void unregisterProtocolHandler(const String& scheme, const String& baseURL, const String& url) = 0;
-#endif
 };
 
 void provideNavigatorContentUtilsTo(Page*, NavigatorContentUtilsClient*);
 
 }
 
 #endif // ENABLE(NAVIGATOR_CONTENT_UTILS)
 #endif // NavigatorContentUtilsClient_h