Remove unused ConditionVariableWrapper on POSIX platforms

webrtc/system_wrappers/source/condition_variable_unittest.cc

 /*
  *  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.
  */
 
 #include "webrtc/system_wrappers/include/condition_variable_wrapper.h"
 
+// TODO(tommi): Remove completely.  As is there is still some code for Windows
+// that relies on ConditionVariableWrapper, but code has been removed on other
+// platforms.
+#if defined(WEBRTC_WIN)
+
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/platform_thread.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/include/tick_util.h"
 #include "webrtc/system_wrappers/include/trace.h"
 
 namespace webrtc {
 
 namespace {
@@ skipping 171 matching lines @@
   int64_t start_ms = TickTime::MillisecondTimestamp();
   EXPECT_FALSE(cond_var->SleepCS(*(crit_sect), kVeryShortWaitMs));
   int64_t end_ms = TickTime::MillisecondTimestamp();
   EXPECT_LE(start_ms + kVeryShortWaitMs, end_ms)
       << "actual elapsed:" << end_ms - start_ms;
 }
 
 }  // anonymous namespace
 
 }  // namespace webrtc
+
+#endif  // defined(WEBRTC_WIN)