Fix leak of a global handle in Debug::Load().

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 840 matching lines @@
   Debugger::set_compiling_natives(false);
 
   // Make sure we mark the debugger as not loading before we might
   // return.
   Debugger::set_loading_debugger(false);
 
   // Check for caught exceptions.
   if (caught_exception) return false;
 
   // Debugger loaded.
-  debug_context_ = Handle<Context>::cast(GlobalHandles::Create(*context));
+  debug_context_ = context;
 
   return true;
 }
 
 
 void Debug::Unload() {
   // Return debugger is not loaded.
   if (!IsLoaded()) {
     return;
   }
@@ skipping 2198 matching lines @@
     {
       Locker locker;
       Debugger::CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal