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

minidump/minidump_string_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_string_writer.h"
 
 #include <dbghelp.h>
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 #include "util/file/string_file_writer.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 const MINIDUMP_STRING* MinidumpStringCast(const StringFileWriter& file_writer) {
   return reinterpret_cast<const MINIDUMP_STRING*>(&file_writer.string()[0]);
 }
 
 TEST(MinidumpStringWriter, MinidumpUTF16StringWriter) {
   StringFileWriter file_writer;
 
   {
     SCOPED_TRACE("unset");
     file_writer.Reset();
@@ skipping 151 matching lines @@
         MinidumpUTF8StringCast(file_writer);
     EXPECT_EQ(kTestData[index].length, minidump_string->Length);
     EXPECT_EQ(0,
               memcmp(kTestData[index].string,
                      minidump_string->Buffer,
                      expected_utf8_bytes_with_nul));
   }
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad