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

util/posix/process_util_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/posix/process_util.h"
 
 #include <crt_externs.h>
 #include <unistd.h>
 
 #include <string>
 #include <vector>
 
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(ProcessUtil, ProcessArgumentsForPID) {
   std::vector<std::string> argv;
   ASSERT_TRUE(ProcessArgumentsForPID(getpid(), &argv));
 
   // gtest argv processing scrambles argv, but it leaves argc and argv[0]
   // intact, so test those.
 
   int argc = static_cast<int>(argv.size());
   int expect_argc = *_NSGetArgc();
   EXPECT_EQ(expect_argc, argc);
 
   ASSERT_GE(expect_argc, 1);
   ASSERT_GE(argc, 1);
 
   char** expect_argv = *_NSGetArgv();
   EXPECT_EQ(std::string(expect_argv[0]), argv[0]);
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad