Fix build.

src/top.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 544 matching lines @@
     ExceptionScope() :
       // Scope currently can only be used for regular exceptions, not
       // failures like OOM or termination exception.
       pending_exception_(Top::pending_exception()->ToObjectUnchecked()),
       external_caught_exception_(Top::external_caught_exception()),
       catcher_(Top::catcher())
     { }
 
     ~ExceptionScope() {
       Top::set_catcher(catcher_);
-      Top::set_external_caught_exception(external_caught_exception);
+      Top::set_external_caught_exception(external_caught_exception_);
       Top::set_pending_exception(*pending_exception_);
     }
 
    private:
     Handle<Object> pending_exception_;
     bool external_caught_exception_;
     v8::TryCatch* catcher_;
   };
 };
 
@@ skipping 69 matching lines @@
   static void Unlock() { Top::break_access_->Unlock(); }
 
   static bool TryLock() {
     return Top::break_access_->TryLock();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOP_H_