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

util/test/multiprocess_test.cc

Index: util/test/multiprocess_test.cc
diff --git a/util/test/multiprocess_test.cc b/util/test/multiprocess_test.cc
index b1a9685645186262b3082bfd74061e96d455d795..ec4394e0d2544783eee246600bce0840c67698bd 100644
--- a/util/test/multiprocess_test.cc
+++ b/util/test/multiprocess_test.cc
@@ -22,11 +22,10 @@
 #include "gtest/gtest.h"
 #include "util/file/fd_io.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 class TestMultiprocess final : public Multiprocess {
  public:
   TestMultiprocess() : Multiprocess() {}
@@ -292,3 +291,5 @@ TEST(MultiprocessDeathTest, ChildClosesReadAndWritePipe) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad