Bring back source line accidentally removed in r4217.

src/debug.cc

 // 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 702 matching lines @@
   if (caught_exception) {
     Handle<Object> message = MessageHandler::MakeMessageObject(
         "error_loading_debugger", NULL, Vector<Handle<Object> >::empty(),
         Handle<String>());
     MessageHandler::ReportMessage(NULL, message);
     return false;
   }
 
   // Mark this script as native and return successfully.
   Handle<Script> script(Script::cast(function->shared()->script()));
+  script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
   return true;
 }
 
 
 bool Debug::Load() {
   // Return if debugger is already loaded.
   if (IsLoaded()) return true;
 
   // Bail out if we're already in the process of compiling the native
   // JavaScript source code for the debugger.
@@ skipping 2044 matching lines @@
     {
       Locker locker;
       Debugger::CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal