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

minidump/minidump_memory_writer_test.cc

Index: minidump/minidump_memory_writer_test.cc
diff --git a/minidump/minidump_memory_writer_test.cc b/minidump/minidump_memory_writer_test.cc
index 3e469874508899de782968fca7ec17dbb2c188d3..d81107dbd295f3e4e91f58d7af7d3b0eee0a3ff9 100644
--- a/minidump/minidump_memory_writer_test.cc
+++ b/minidump/minidump_memory_writer_test.cc
@@ -25,11 +25,10 @@
 #include "minidump/minidump_test_util.h"
 #include "util/file/string_file_writer.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 const MinidumpStreamType kBogusStreamType =
     static_cast<MinidumpStreamType>(1234);
 
@@ -389,3 +388,5 @@ TEST(MinidumpMemoryWriter, ExtraMemory) {
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad