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

util/mach/exception_ports_test.cc

Index: util/mach/exception_ports_test.cc
diff --git a/util/mach/exception_ports_test.cc b/util/mach/exception_ports_test.cc
index a5424a58f26c6eb7dcee20254c49915084f19d7c..56cda3c25fd16377af08167e3cbe9ce77ce28ff1 100644
--- a/util/mach/exception_ports_test.cc
+++ b/util/mach/exception_ports_test.cc
@@ -33,11 +33,10 @@
 #include "util/test/mac/mach_errors.h"
 #include "util/test/mac/mach_multiprocess.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 // Calls GetExceptionPorts() on its |exception_ports| argument to look up the
 // EXC_MASK_CRASH handler. If |expect_port| is not MACH_PORT_NULL, it expects to
 // find a handler for this mask whose port matches |expect_port| and whose
@@ -574,3 +573,5 @@ TEST(ExceptionPorts, HostExceptionPorts) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad