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

minidump/minidump_file_writer_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 "minidump/minidump_file_writer.h"
 
 #include <dbghelp.h>
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 #include "minidump/minidump_stream_writer.h"
 #include "minidump/minidump_test_util.h"
 #include "minidump/minidump_writable.h"
 #include "util/file/file_writer.h"
 #include "util/file/string_file_writer.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 TEST(MinidumpFileWriter, Empty) {
   MinidumpFileWriter minidump_file;
   StringFileWriter file_writer;
   ASSERT_TRUE(minidump_file.WriteEverything(&file_writer));
   ASSERT_EQ(sizeof(MINIDUMP_HEADER), file_writer.string().size());
 
   const MINIDUMP_HEADER* header =
       reinterpret_cast<const MINIDUMP_HEADER*>(&file_writer.string()[0]);
 
   VerifyMinidumpHeader(header, 0, 0);
@@ skipping 211 matching lines @@
 
   // It is an error to add a second stream of the same type.
   const size_t kStream2Size = 3;
   const MinidumpStreamType kStream2Type = static_cast<MinidumpStreamType>(0x4d);
   const uint8_t kStream2Value = 0xa5;
   TestStream stream2(kStream2Type, kStream2Size, kStream2Value);
   ASSERT_DEATH(minidump_file.AddStream(&stream2), "already present");
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad