Remove unused macro definition.

src/top.cc

 // 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 44 matching lines @@
   return top_addresses[id];
 }
 
 char* Top::Iterate(ObjectVisitor* v, char* thread_storage) {
   ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
   Iterate(v, thread);
   return thread_storage + sizeof(ThreadLocalTop);
 }
 
 
-#define VISIT(field) v->VisitPointer(reinterpret_cast<Object**>(&(field)));
-
 void Top::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
   v->VisitPointer(&(thread->pending_exception_));
   v->VisitPointer(&(thread->pending_message_obj_));
   v->VisitPointer(
       bit_cast<Object**, Script**>(&(thread->pending_message_script_)));
   v->VisitPointer(bit_cast<Object**, Context**>(&(thread->context_)));
   v->VisitPointer(&(thread->scheduled_exception_));
 
   for (v8::TryCatch* block = thread->try_catch_handler_;
        block != NULL;
        block = block->next_) {
     v->VisitPointer(bit_cast<Object**, void**>(&(block->exception_)));
     v->VisitPointer(bit_cast<Object**, void**>(&(block->message_)));
   }
 
   // Iterate over pointers on native execution stack.
   for (StackFrameIterator it(thread); !it.done(); it.Advance()) {
     it.frame()->Iterate(v);
   }
 }
-#undef VISIT
 
 
 void Top::Iterate(ObjectVisitor* v) {
   ThreadLocalTop* current_t = &thread_local_;
   Iterate(v, current_t);
 }
 
 
 void Top::InitializeThreadLocal() {
   thread_local_.c_entry_fp_ = 0;
@@ skipping 859 matching lines @@
   Top::break_access_->Lock();
 }
 
 
 ExecutionAccess::~ExecutionAccess() {
   Top::break_access_->Unlock();
 }
 
 
 } }  // namespace v8::internal