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

minidump/minidump_misc_info_writer_test.cc

Index: minidump/minidump_misc_info_writer_test.cc
diff --git a/minidump/minidump_misc_info_writer_test.cc b/minidump/minidump_misc_info_writer_test.cc
index ca22b5929a8cdf40feef8addeb26b73f69164497..ea22b59e40a4a090d169022d28db415875707803 100644
--- a/minidump/minidump_misc_info_writer_test.cc
+++ b/minidump/minidump_misc_info_writer_test.cc
@@ -28,11 +28,10 @@
 #include "util/file/string_file_writer.h"
 #include "util/stdlib/strlcpy.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 template <typename T>
 void GetMiscInfoStream(const std::string& file_contents, const T** misc_info) {
   const size_t kDirectoryOffset = sizeof(MINIDUMP_HEADER);
@@ -656,3 +655,5 @@ TEST(MinidumpMiscInfoWriter, Everything) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad