cc: Unify namespaces for all test files

cc/test/paths.h

 // 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.
 
 #ifndef CC_TEST_PATHS_H_
 #define CC_TEST_PATHS_H_
 
 namespace cc {
-namespace test {
 
 enum {
   PATH_START = 5000,
 
   // Valid only in development and testing environments.
   DIR_TEST_DATA,
 
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 void RegisterPathProvider();
 
-}  // namespace test
 }  // namespace cc
 
 #endif  // CC_TEST_PATHS_H_