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

util/stdlib/strlcpy_test.cc

Index: util/stdlib/strlcpy_test.cc
diff --git a/util/stdlib/strlcpy_test.cc b/util/stdlib/strlcpy_test.cc
index 1cf187c285e113088f1ee69bfbaa96dad1d1e7f3..8eb656daa392f5c107dd4956ec8c96d2ce5293e3 100644
--- a/util/stdlib/strlcpy_test.cc
+++ b/util/stdlib/strlcpy_test.cc
@@ -23,10 +23,10 @@
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(strlcpy, c16lcpy) {
   // Use a destination buffer that’s larger than the length passed to c16lcpy.
   // The unused portion is a guard area that must not be written to.
@@ -89,3 +89,5 @@ TEST(strlcpy, c16lcpy) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad