[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io_test/kernel_object_test.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 <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/stat.h>
 
 #include <map>
 #include <string>
 
 #include "nacl_io/kernel_handle.h"
 #include "nacl_io/kernel_object.h"
 #include "nacl_io/mount.h"
 #include "nacl_io/path.h"
 
 #include "gtest/gtest.h"
 
+using namespace nacl_io;
+
 namespace {
 
 class MountNodeRefMock : public MountNode {
  public:
   MountNodeRefMock(Mount* mnt) : MountNode(mnt) {}
 };
 
 class MountRefMock : public Mount {
  public:
   MountRefMock() {}
@@ skipping 151 matching lines @@
   EXPECT_EQ(3, raw_handle->RefCount());
 
   handle.reset();
   EXPECT_EQ(2, raw_handle->RefCount());
 
   proxy->AcquireHandle(5, &handle);
   EXPECT_EQ(3, raw_handle->RefCount());
   EXPECT_EQ(raw_handle, handle.get());
 }