Revert of High resolution timer fix for Windows

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 7a6c394da41ad7bdad6e3cd0d62991cfed16b7ab..330bde6d2e8da68dccf0c1af1fcfaf2a8d081138 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -371,6 +371,10 @@
   void AddTaskObserver(TaskObserver* task_observer);
   void RemoveTaskObserver(TaskObserver* task_observer);
 
+  // When we go into high resolution timer mode, we will stay in hi-res mode
+  // for at least 1s.
+  static const int kHighResolutionTimerModeLeaseTimeMs = 1000;
+
 #if defined(OS_WIN)
   void set_os_modal_loop(bool os_modal_loop) {
     os_modal_loop_ = os_modal_loop;
@@ -386,7 +390,7 @@
 
   // Returns true if the message loop has high resolution timers enabled.
   // Provided for testing.
-  bool HasHighResolutionTasks();
+  bool IsHighResolutionTimerEnabledForTesting();
 
   // Returns true if the message loop is "idle". Provided for testing.
   bool IsIdleForTesting();
@@ -455,14 +459,6 @@
   // A list of tasks that need to be processed by this instance.  Note that
   // this queue is only accessed (push/pop) by our current thread.
   TaskQueue work_queue_;
-
-  // How many high resolution tasks are in the pending task queue. This value
-  // increases by N every time we call ReloadWorkQueue() and decreases by 1
-  // every time we call RunTask() if the task needs a high resolution timer.
-  int pending_high_res_tasks_;
-  // Tracks if we have requested high resolution timers. Its only use is to
-  // turn off the high resolution timer upon loop destruction.
-  bool in_high_res_mode_;
 
   // Contains delayed tasks, sorted by their 'delayed_run_time' property.
   DelayedTaskQueue delayed_work_queue_;