Use platform implementation of Monitor in thread pool

runtime/bin/thread_pool_linux.h

Index: runtime/bin/thread_pool_linux.h
diff --git a/runtime/bin/thread_pool_linux.h b/runtime/bin/thread_pool_linux.h
index 4b3a7449aef0d81e9a34e3ec964f577146cd4b8d..704722bbc5c9a65f6f45baff87a2946281b780d3 100644
--- a/runtime/bin/thread_pool_linux.h
+++ b/runtime/bin/thread_pool_linux.h
@@ -10,24 +10,6 @@
 #include "platform/globals.h"
 
 
-class TaskQueueData {
- private:
-  TaskQueueData() {}
-  ~TaskQueueData() {}
-
-  pthread_mutex_t* mutex() { return &mutex_; }
-  pthread_cond_t* cond() { return &cond_; }
-
-  pthread_mutex_t mutex_;
-  pthread_cond_t cond_;
-
-  friend class TaskQueue;
-
-  DISALLOW_ALLOCATION();
-  DISALLOW_COPY_AND_ASSIGN(TaskQueueData);
-};
-
-
 class ThreadPoolData {
  private:
   ThreadPoolData() {}