Move platform_thread to base/threading and put in the base namespace. I left ...

base/base.gyp

 # Copyright (c) 2010 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'base.gypi',
@@ skipping 94 matching lines @@
         'message_pump_glib_unittest.cc',
         'metrics/field_trial_unittest.cc',
         'metrics/histogram_unittest.cc',
         'metrics/stats_table_unittest.cc',
         'non_thread_safe_unittest.cc',
         'object_watcher_unittest.cc',
         'observer_list_unittest.cc',
         'path_service_unittest.cc',
         'pickle_unittest.cc',
         'platform_file_unittest.cc',
-        'platform_thread_unittest.cc',
         'pr_time_unittest.cc',
         'process_util_unittest.cc',
         'process_util_unittest_mac.h',
         'process_util_unittest_mac.mm',
         'rand_util_unittest.cc',
         'ref_counted_unittest.cc',
         'scoped_native_library_unittest.cc',
         'scoped_ptr_unittest.cc',
         'scoped_temp_dir_unittest.cc',
         'sha1_unittest.cc',
         'sha2_unittest.cc',
         'shared_memory_unittest.cc',
         'singleton_unittest.cc',
         'stack_container_unittest.cc',
         'string16_unittest.cc',
         'string_number_conversions_unittest.cc',
         'string_piece_unittest.cc',
         'string_split_unittest.cc',
         'string_tokenizer_unittest.cc',
         'string_util_unittest.cc',
         'stringize_macros_unittest.cc',
         'stringprintf_unittest.cc',
         'sys_info_unittest.cc',
         'sys_string_conversions_mac_unittest.mm',
         'sys_string_conversions_unittest.cc',
         'task_queue_unittest.cc',
         'task_unittest.cc',
+        'threading/platform_thread_unittest.cc',
         'threading/simple_thread_unittest.cc',
+        'threading/thread_checker_unittest.cc',
         'threading/thread_local_storage_unittest.cc',
         'threading/thread_local_unittest.cc',
         'threading/watchdog_unittest.cc',
         'threading/worker_pool_posix_unittest.cc',
         'threading/worker_pool_unittest.cc',
-        'thread_checker_unittest.cc',
         'thread_collision_warner_unittest.cc',
         'thread_unittest.cc',
         'time_unittest.cc',
         'time_win_unittest.cc',
         'timer_unittest.cc',
         'tools_sanity_unittest.cc',
         'tracked_objects_unittest.cc',
         'tuple_unittest.cc',
         'utf_offset_string_conversions_unittest.cc',
         'utf_string_conversions_unittest.cc',
@@ skipping 163 matching lines @@
       ],
     }],
   ],
 }
 
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