Revert "Hide Isolate pointer from embedder"

runtime/include/dart_native_api.h

 /*
  * Copyright (c) 2013, 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 INCLUDE_DART_NATIVE_API_H_
 #define INCLUDE_DART_NATIVE_API_H_
 
 #include "include/dart_api.h"
@@ skipping 105 matching lines @@
  * Creates a new native port.  When messages are received on this
  * native port, then they will be dispatched to the provided native
  * message handler.
  *
  * \param name The name of this port in debugging messages.
  * \param handler The C handler to run when messages arrive on the port.
  * \param handle_concurrently Is it okay to process requests on this
  *                            native port concurrently?
  *
  * \return If successful, returns the port id for the native port.  In
- *   case of error, returns DART_ILLEGAL_PORT.
+ *   case of error, returns ILLEGAL_PORT.
  */
 DART_EXPORT Dart_Port Dart_NewNativePort(const char* name,
                                          Dart_NativeMessageHandler handler,
                                          bool handle_concurrently);
 /* TODO(turnidge): Currently handle_concurrently is ignored. */
 
 /**
  * Closes the native port with the given id.
  *
  * The port must have been allocated by a call to Dart_NewNativePort.
@@ skipping 13 matching lines @@
 
 /**
  * Forces all loaded classes and functions to be compiled eagerly in
  * the current isolate..
  *
  * TODO(turnidge): Document.
  */
 DART_EXPORT Dart_Handle Dart_CompileAll();
 
 #endif  /* INCLUDE_DART_NATIVE_API_H_ */  /* NOLINT */