Removing redundant stub for runtime native calls.

src/debug.h

 // Copyright 2006-2008 the V8 project authors. 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 documentation and/or other materials provided
@@ skipping 114 matching lines @@
 
  protected:
   bool RinfoDone() const;
   void RinfoNext();
 
   BreakLocatorType type_;
   int break_point_;
   int position_;
   int statement_position_;
   Handle<DebugInfo> debug_info_;
-  Handle<Code> debug_break_stub_;
   RelocIterator* reloc_iterator_;
   RelocIterator* reloc_iterator_original_;
 
  private:
   void SetDebugBreak();
   void ClearDebugBreak();
 
   void SetDebugBreakAtIC();
   void ClearDebugBreakAtIC();
 
@@ skipping 741 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_H_