[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/sdk_util/scoped_ref.h

 /* Copyright 2013 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.
  */
 
 #ifndef LIBRARIES_SDK_UTIL_SCOPED_REF_H_
 #define LIBRARIES_SDK_UTIL_SCOPED_REF_H_
 
 #include <stdlib.h>
 
 #include "sdk_util/macros.h"
 #include "sdk_util/ref_object.h"
 
+namespace sdk_util {
+
 class ScopedRefBase {
  protected:
   ScopedRefBase() : ptr_(NULL) {}
   ~ScopedRefBase() { reset(NULL); }
 
   void reset(RefObject* obj) {
     if (obj) {
       obj->Acquire();
     }
     if (ptr_) {
@@ skipping 49 matching lines @@
  private:
   typedef void (ScopedRef::*bool_as_func_ptr)() const;
   void bool_as_func_impl() const {};
 
  public:
   operator bool_as_func_ptr() const {
     return (ptr_ != NULL) ? &ScopedRef::bool_as_func_impl : 0;
   }
 };
 
+}  // namespace sdk_util
+
 #endif  // LIBRARIES_SDK_UTIL_SCOPED_REF_H_