Remove unused ThreadSafeHandleURI from ui_interface

src/ui_interface.h

@@ -75,9 +75,6 @@ public:
     /** Ask the user whether they want to pay a fee or not. */
     boost::signals2::signal<bool (int64_t nFeeRequired), boost::signals2::last_value<bool> > ThreadSafeAskFee;
 
-    /** Handle a URL passed at the command line. */
-    boost::signals2::signal<void (const std::string& strURI)> ThreadSafeHandleURI;
-
     /** Progress message during initialization. */
     boost::signals2::signal<void (const std::string &message)> InitMessage;