Add ENABLE_DEBUGGER_SUPPORT macro....

src/execution.h

Index: src/execution.h
===================================================================
--- src/execution.h	(revision 1738)
+++ src/execution.h	(working copy)
@@ -118,8 +118,9 @@
                                           Handle<JSFunction> fun,
                                           Handle<Object> pos,
                                           Handle<Object> is_global);
-
+#ifdef ENABLE_DEBUGGER_SUPPORT
   static Object* DebugBreakHelper();
+#endif
 
   // If the stack guard is triggered, but it is not an actual
   // stack overflow, then handle the interruption accordingly.
@@ -158,11 +159,13 @@
   static void Preempt();
   static bool IsInterrupted();
   static void Interrupt();
+  static void Continue(InterruptFlag after_what);
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  static void DebugBreak();
+  static void DebugCommand();
   static bool IsDebugBreak();
-  static void DebugBreak();
   static bool IsDebugCommand();
-  static void DebugCommand();
-  static void Continue(InterruptFlag after_what);
+#endif
 
  private:
   // You should hold the ExecutionAccess lock when calling this method.