Switch to using TimeTicks rather than Time in message loops

base/message_pump_libevent.cc

Index: base/message_pump_libevent.cc
===================================================================
--- base/message_pump_libevent.cc	(revision 65315)
+++ base/message_pump_libevent.cc	(working copy)
@@ -290,7 +290,7 @@
     if (delayed_work_time_.is_null()) {
       event_base_loop(event_base_, EVLOOP_ONCE);
     } else {
-      TimeDelta delay = delayed_work_time_ - Time::Now();
+      TimeDelta delay = delayed_work_time_ - TimeTicks::Now();
       if (delay > TimeDelta()) {
         struct timeval poll_tv;
         poll_tv.tv_sec = delay.InSeconds();
@@ -303,7 +303,7 @@
       } else {
         // It looks like delayed_work_time_ indicates a time in the past, so we
         // need to call DoDelayedWork now.
-        delayed_work_time_ = Time();
+        delayed_work_time_ = TimeTicks();
       }
     }
   }
@@ -326,7 +326,8 @@
       << "[nwrite:" << nwrite << "] [errno:" << errno << "]";
 }
 
-void MessagePumpLibevent::ScheduleDelayedWork(const Time& delayed_work_time) {
+void MessagePumpLibevent::ScheduleDelayedWork(
+    const TimeTicks& delayed_work_time) {
   // We know that we can't be blocked on Wait right now since this method can
   // only be called on the same thread as Run, so we only need to update our
   // record of how long to sleep when we do sleep.