Always include debugger support.

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 23 matching lines @@
 #include "debug-agent.h"
 #include "execution.h"
 #include "factory.h"
 #include "flags.h"
 #include "frames-inl.h"
 #include "hashmap.h"
 #include "platform.h"
 #include "string-stream.h"
 #include "v8threads.h"
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
 #include "../include/v8-debug.h"
 
 namespace v8 {
 namespace internal {
 
 
 // Forward declarations.
 class EnterDebugger;
 
 
@@ skipping 1004 matching lines @@
   Semaphore sem_;
   Mutex mutex_;
   bool already_signalled_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // ENABLE_DEBUGGER_SUPPORT
-
 #endif  // V8_DEBUG_H_