[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io_test/kernel_wrap_test.cc

 /* Copyright (c) 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.
  */
 
 #include <string>
 #include <vector>
 #include "gtest/gtest.h"
 #include "nacl_io/kernel_proxy.h"
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_wrap.h"
 #include "kernel_proxy_mock.h"
 
+using namespace nacl_io;
+
 using ::testing::_;
 using ::testing::Return;
 using ::testing::StrEq;
 
 namespace {
 
 #define COMPARE_FIELD(f) \
   if (arg->f != statbuf->f) { \
     *result_listener << "mismatch of field \""#f"\". " \
       "expected: " << statbuf->f << \
@@ skipping 252 matching lines @@
   const struct utimbuf* times;
   EXPECT_CALL(mock, utime(StrEq("utime"), times));
   utime("utime", times);
 }
 
 TEST_F(KernelWrapTest, write) {
   EXPECT_CALL(mock, write(6789, NULL, 7891)).Times(1);
   write(6789, NULL, 7891);
 }