Add ability to load pnacl resources from DIR_PNACL_COMPONENT.

ppapi/native_client/src/trusted/plugin/plugin.h

 // -*- c++ -*-
 // 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.
 
 // The portable representation of an instance and root scriptable object.
 // The PPAPI version of the plugin instantiates a subclass of this class.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
@@ skipping 301 matching lines @@
   const pp::URLUtil_Dev* url_util() const { return url_util_; }
 
   // Extracts the exit status from the (main) service runtime.
   int exit_status() const {
     if (NULL == main_service_runtime()) {
       return -1;
     }
     return main_service_runtime()->exit_status();
   }
 
-  const PPB_NaCl_Private* nacl_interface() { return nacl_interface_; }
+  const PPB_NaCl_Private* nacl_interface() const { return nacl_interface_; }
 
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(Plugin);
   // Prevent construction and destruction from outside the class:
   // must use factory New() method instead.
   explicit Plugin(PP_Instance instance);
   // The browser will invoke the destructor via the pp::Instance
   // pointer to this object, not from base's Delete().
   ~Plugin();
 
@@ skipping 198 matching lines @@
 
   // Whether we are using IPC-based PPAPI proxy.
   bool using_ipc_proxy_;
 
   const PPB_NaCl_Private* nacl_interface_;
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_