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

util/mach/exception_behaviors_test.cc

Index: util/mach/exception_behaviors_test.cc
diff --git a/util/mach/exception_behaviors_test.cc b/util/mach/exception_behaviors_test.cc
index c4497d615e1e4c6628a8a890d592012923e3dd57..cbde600a4b87f6e655c947452bf5a4685eac031a 100644
--- a/util/mach/exception_behaviors_test.cc
+++ b/util/mach/exception_behaviors_test.cc
@@ -19,10 +19,10 @@
 #include "gtest/gtest.h"
 #include "util/mach/mach_extensions.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(ExceptionBehaviors, ExceptionBehaviors) {
   struct TestData {
     exception_behavior_t behavior;
@@ -68,3 +68,5 @@ TEST(ExceptionBehaviors, ExceptionBehaviors) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad