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

util/test/mac/mach_multiprocess_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/test/mac/mach_multiprocess.h"
 
 #include <unistd.h>
 
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-using namespace crashpad::test;
-
 class TestMachMultiprocess final : public MachMultiprocess {
  public:
   TestMachMultiprocess() : MachMultiprocess() {}
 
   ~TestMachMultiprocess() {}
 
  private:
   // MachMultiprocess will have already exercised the Mach ports for IPC and the
   // child task port.
   virtual void MachMultiprocessParent() override {}
 
   virtual void MachMultiprocessChild() override {}
 
   DISALLOW_COPY_AND_ASSIGN(TestMachMultiprocess);
 };
 
 TEST(MachMultiprocess, MachMultiprocess) {
   TestMachMultiprocess mach_multiprocess;
   mach_multiprocess.Run();
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad