Changed the debugger API to allow only one debug event listener to be registe...

test/mjsunit/debug-enable-disable-breakpoints.js

 // Copyright 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 21 matching lines @@
 // Simple debug event handler which just counts the number of break points hit.
 var break_point_hit_count;
 
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break) {
     break_point_hit_count++;
   }
 };
 
 // Add the debug event listener.
-Debug.addListener(listener);
+Debug.setListener(listener);
 
 // Test function.
 function f() {a=1;b=2;};
 
 // This tests enabeling and disabling of break points including the case
 // with several break points in the same location.
 break_point_hit_count = 0;
 
 // Set a breakpoint in f.
 bp1 = Debug.setBreakPoint(f);
@@ skipping 28 matching lines @@
 // Enable both breakpoints.
 Debug.enableBreakPoint(bp1);
 Debug.enableBreakPoint(bp2);
 f();
 assertEquals(5, break_point_hit_count);
 
 // Disable the first breakpoint.
 Debug.disableBreakPoint(bp1);
 f();
 assertEquals(6, break_point_hit_count);