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

util/mac/checked_mach_address_range_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 "util/mac/checked_mach_address_range.h"
 
 #include <mach/mach.h>
 
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "gtest/gtest.h"
 #include "util/mac/process_reader.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 #if defined(ARCH_CPU_64_BITS)
 const bool kValid64Invalid32 = true;
 #else
 const bool kValid64Invalid32 = false;
 #endif
 
 TEST(CheckedMachAddressRange, IsValid) {
   const struct TestData {
     mach_vm_address_t base;
     mach_vm_size_t size;
@@ skipping 206 matching lines @@
 
     child_range_64.SetRange(&process_reader, 0x100000ffe, 2);
     EXPECT_TRUE(parent_range_64.ContainsRange(child_range_64));
 
     child_range_64.SetRange(&process_reader, 0x100000fff, 2);
     EXPECT_FALSE(parent_range_64.ContainsRange(child_range_64));
   }
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad