Revert "Hide Isolate pointer from embedder"

runtime/bin/dbg_message.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_DBG_MESSAGE_H_
 #define BIN_DBG_MESSAGE_H_
 
 #include "bin/builtin.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
@@ skipping 129 matching lines @@
         next_(next) {
   }
   ~DbgMsgQueue() {
     DbgMessage* msg = msglist_head_;
     while (msglist_head_ != NULL) {
       msglist_head_ = msglist_head_->next();
       delete msg;
       msg = msglist_head_;
     }
     msglist_tail_ = NULL;
-    isolate_id_ = DART_ILLEGAL_ISOLATE_ID;
+    isolate_id_ = ILLEGAL_ISOLATE_ID;
     next_ = NULL;
   }
 
   // Accessors.
   Dart_IsolateId isolate_id() const { return isolate_id_; }
   DbgMsgQueue* next() const { return next_; }
   void set_next(DbgMsgQueue* next) { next_ = next; }
 
   // Add specified debug command message to the queue.
   void AddMessage(int32_t cmd_idx,
@@ skipping 112 matching lines @@
   static Mutex* msg_queue_list_lock_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(DbgMsgQueueList);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DBG_MESSAGE_H_