Hide knowledge of webkit::ppapi::Plugin from chrome. This is part of moving ppapi implementation fr…

ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "native_client/src/include/nacl_macros.h"
 #include "ppapi/native_client/src/trusted/plugin/nacl_entry_points.h"
 #include "ppapi/native_client/src/trusted/plugin/sel_ldr_launcher_chrome.h"
 
 #include "ppapi/cpp/var.h"
 
@@ skipping 20 matching lines @@
   PP_Var var_error_message;
   // send a synchronous message to the browser process
   if (launch_nacl_process(instance,
                           url,
                           PP_FromBool(uses_irt),
                           PP_FromBool(uses_ppapi),
                           PP_FromBool(enable_ppapi_dev),
                           PP_FromBool(enable_dyncode_syscalls),
                           PP_FromBool(enable_exception_handling),
                           &channel_,
-                          &var_error_message) != PP_NACL_OK) {
+                          &var_error_message) != PP_EXTERNAL_PLUGIN_OK) {
     pp::Var var_error_message_cpp(pp::PASS_REF, var_error_message);
     if (var_error_message_cpp.is_string()) {
       *error_message = var_error_message_cpp.AsString();
     }
     return false;
   }
   return true;
 }
 
 }  // namespace plugin