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

client/simple_string_dictionary_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "client/simple_string_dictionary.h"
 
 #include "base/logging.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(SimpleStringDictionary, Entry) {
   typedef TSimpleStringDictionary<5, 9, 15> TestMap;
   TestMap map;
 
   const TestMap::Entry* entry = TestMap::Iterator(map).Next();
   EXPECT_FALSE(entry);
 
   // Try setting a key/value and then verify.
   map.SetKeyValue("key1", "value1");
   entry = TestMap::Iterator(map).Next();
@@ skipping 252 matching lines @@
   EXPECT_STREQ("there", map.GetValueForKey("hi"));
 
   ASSERT_DEATH(map.GetValueForKey(NULL), "key");
   map.RemoveKey("hi");
   EXPECT_EQ(0u, map.GetCount());
 }
 
 #endif
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad