cc: Unify namespaces for all test files

cc/test/run_all_unittests.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
 #include "base/test/test_suite.h"
 #include "cc/test/cc_test_suite.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 int main(int argc, char** argv) {
   ::testing::InitGoogleMock(&argc, argv);
-  cc::test::CCTestSuite test_suite(argc, argv);
+  cc::CCTestSuite test_suite(argc, argv);
   int result = test_suite.Run();
 
   return result;
 }