Deleted OS_WIN and all Windows specific files from base.

base/message_loop/incoming_task_queue.cc

Index: base/message_loop/incoming_task_queue.cc
diff --git a/base/message_loop/incoming_task_queue.cc b/base/message_loop/incoming_task_queue.cc
index 5e9a4613da1cad2a28369aa78b69e87001ad9e9f..06a5b3b66810706ede68cf0d1c5a5075f4f84ed7 100644
--- a/base/message_loop/incoming_task_queue.cc
+++ b/base/message_loop/incoming_task_queue.cc
@@ -61,17 +61,6 @@ bool IncomingTaskQueue::AddToIncomingQueue(
   AutoLock locked(incoming_queue_lock_);
   PendingTask pending_task(
       from_here, task, CalculateDelayedRuntime(delay), nestable);
-#if defined(OS_WIN)
-  // We consider the task needs a high resolution timer if the delay is
-  // more than 0 and less than 32ms. This caps the relative error to
-  // less than 50% : a 33ms wait can wake at 48ms since the default
-  // resolution on Windows is between 10 and 15ms.
-  if (delay > TimeDelta() &&
-      delay.InMilliseconds() < (2 * Time::kMinLowResolutionThresholdMs)) {
-    ++high_res_task_count_;
-    pending_task.is_high_res = true;
-  }
-#endif
   return PostPendingTask(&pending_task);
 }