Clean up runtime functions.

src/debug.h

Index: src/debug.h
diff --git a/src/debug.h b/src/debug.h
index d5125956a0e96a03294d60cee1bd144121cbd77e..fb60cc410bbe9395ae5565da9bd7db9ce4a79a04 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -228,7 +228,7 @@ class Debug {
   void PreemptionWhileInDebugger();
   void Iterate(ObjectVisitor* v);
 
-  static Object* Break(RUNTIME_CALLING_CONVENTION);
+  Object* Break(Arguments args);
   void SetBreakPoint(Handle<SharedFunctionInfo> shared,
                      Handle<Object> break_point_object,
                      int* source_position);
@@ -548,6 +548,9 @@ class Debug {
 };
 
 
+DECLARE_RUNTIME_FUNCTION(Object*, 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 {