Don’t use using directives (“using namespace”) in tests

util/stdlib/strnlen_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/stdlib/strnlen.h"
 
 #include <string.h>
 
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
 TEST(strnlen, strnlen) {
   const char kTestBuffer[] = "abc\0d";
   ASSERT_EQ(3u, strlen(kTestBuffer));
   EXPECT_EQ(0u, crashpad::strnlen(kTestBuffer, 0));
   EXPECT_EQ(1u, crashpad::strnlen(kTestBuffer, 1));
   EXPECT_EQ(2u, crashpad::strnlen(kTestBuffer, 2));
   EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 3));
   EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 4));
   EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 5));
   EXPECT_EQ(3u, crashpad::strnlen(kTestBuffer, 6));
 
   const char kEmptyBuffer[] = "\0";
   ASSERT_EQ(0u, strlen(kEmptyBuffer));
   EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 0));
   EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 1));
   EXPECT_EQ(0u, crashpad::strnlen(kEmptyBuffer, 2));
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad