Deleted OS_WIN and all Windows specific files from base.

base/message_loop/message_pump_default.cc

Index: base/message_loop/message_pump_default.cc
diff --git a/base/message_loop/message_pump_default.cc b/base/message_loop/message_pump_default.cc
index daa80d853236a132f880f17de3a382f75f39c5dc..b3c8a1fd6a66d2d81c453f5333d0975ab3c32353 100644
--- a/base/message_loop/message_pump_default.cc
+++ b/base/message_loop/message_pump_default.cc
@@ -54,13 +54,6 @@ void MessagePumpDefault::Run(Delegate* delegate) {
       event_.Wait();
     } else {
       TimeDelta delay = delayed_work_time_ - TimeTicks::Now();
-#if defined(OS_WIN)
-      // If the delay is greater than zero and under 1 ms we need to round up to
-      // 1 ms or else we will end up spinning until it counts down to zero
-      // because sub-ms waits aren't supported on Windows.
-      if (delay > TimeDelta())
-        delay = std::max(delay, TimeDelta::FromMilliseconds(1));
-#endif
       if (delay > TimeDelta()) {
         event_.TimedWait(delay);
       } else {