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

util/misc/clock_test.cc

Index: util/misc/clock_test.cc
diff --git a/util/misc/clock_test.cc b/util/misc/clock_test.cc
index 35ec1ac11678fd89fe8dcb3d3839e16c19979f71..8082e951d3ae2c838c91da67e53858f9d31d9292 100644
--- a/util/misc/clock_test.cc
+++ b/util/misc/clock_test.cc
@@ -23,10 +23,10 @@
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(Clock, ClockMonotonicNanoseconds) {
   uint64_t start = ClockMonotonicNanoseconds();
   EXPECT_GT(start, 0u);
@@ -92,3 +92,5 @@ TEST(Clock, SleepNanoseconds) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad