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

util/test/mac/mach_multiprocess_test.cc

Index: util/test/mac/mach_multiprocess_test.cc
diff --git a/util/test/mac/mach_multiprocess_test.cc b/util/test/mac/mach_multiprocess_test.cc
index 39295f65fe1c93a2229a341f17387325402d2fa0..388831fd4139d4493612ec15724796fa6bbd4de7 100644
--- a/util/test/mac/mach_multiprocess_test.cc
+++ b/util/test/mac/mach_multiprocess_test.cc
@@ -19,11 +19,10 @@
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 class TestMachMultiprocess final : public MachMultiprocess {
  public:
   TestMachMultiprocess() : MachMultiprocess() {}
@@ -46,3 +45,5 @@ TEST(MachMultiprocess, MachMultiprocess) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad