Return Object* instead of MaybeObject* from runtime calls.

src/debug.h

 // Copyright 2012 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 619 matching lines @@
   Code* debug_break_slot_;
 
   Isolate* isolate_;
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Debug);
 };
 
 
-DECLARE_RUNTIME_FUNCTION(Object*, Debug_Break);
+DECLARE_RUNTIME_FUNCTION(Debug_Break);
 
 
 // Message delivered to the message handler callback. This is either a debugger
 // event or the response to a command.
 class MessageImpl: public v8::Debug::Message {
  public:
   // Create a message object for a debug event.
   static MessageImpl NewEvent(DebugEvent event,
                               bool running,
                               Handle<JSObject> exec_state,
@@ skipping 407 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_H_