Remove an unused enumeration value.

src/ast.h

 // 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 934 matching lines @@
     // An indexed slot in a heap context. index() is the
     // variable index in the context object on the heap,
     // starting at 0. var()->scope() is the corresponding
     // scope.
     CONTEXT,
 
     // A named slot in a heap context. var()->name() is the
     // variable name in the context object on the heap,
     // with lookup starting at the current context. index()
     // is invalid.
-    LOOKUP,
-
-    // A property in the global object. var()->name() is
-    // the property name.
-    GLOBAL
+    LOOKUP
   };
 
   Slot(Variable* var, Type type, int index)
       : var_(var), type_(type), index_(index) {
     ASSERT(var != NULL);
   }
 
   virtual void Accept(AstVisitor* v);
 
   // Type testing & conversion
@@ skipping 814 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_