Remove dead code in ScriptArguments.

Source/core/inspector/ScriptArguments.h

 /*
  * Copyright (c) 2010 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 33 matching lines @@
 class ScriptArguments : public RefCountedWillBeGarbageCollectedFinalized<ScriptArguments> {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(ScriptArguments);
 public:
     static PassRefPtrWillBeRawPtr<ScriptArguments> create(ScriptState*, Vector<ScriptValue>& arguments);
 
     const ScriptValue& argumentAt(size_t) const;
     size_t argumentCount() const { return m_arguments.size(); }
 
     ScriptState* scriptState() const { return m_scriptState.get(); }
 
-    bool getFirstArgumentAsString(WTF::String& result, bool checkForNullOrUndefined = false);
+    bool getFirstArgumentAsString(String&) const;
 
     void trace(Visitor*) { }
 
 private:
     ScriptArguments(ScriptState*, Vector<ScriptValue>& arguments);
 
     ScriptStateProtectingContext m_scriptState;
     Vector<ScriptValue> m_arguments;
 };
 
 } // namespace blink
 
 #endif // ScriptArguments_h