Remove implementation of CriticalSectionWrapper and use rtc::CriticalSection

webrtc/system_wrappers/system_wrappers.gyp

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 39 matching lines @@
         'include/utf_util_win.h',
         'source/aligned_malloc.cc',
         'source/atomic32_mac.cc',
         'source/atomic32_posix.cc',
         'source/atomic32_win.cc',
         'source/clock.cc',
         'source/condition_variable_event_win.cc',
         'source/condition_variable_event_win.h',
         'source/cpu_info.cc',
         'source/cpu_features.cc',
-        'source/critical_section.cc',
         'source/data_log.cc',
         'source/data_log_c.cc',
         'source/data_log_no_op.cc',
         'source/event.cc',
         'source/event_timer_posix.cc',
         'source/event_timer_posix.h',
         'source/event_timer_win.cc',
         'source/event_timer_win.h',
         'source/file_impl.cc',
         'source/file_impl.h',
@@ skipping 123 matching lines @@
       'type': 'static_library',
       'dependencies': [
         'system_wrappers',
         'field_trial_default',
         'metrics_default',
       ]
     },
   ], # targets
 }