Revert "Currently, base/timer.cc calls PostTask with FROM_HERE as the Location,

net/disk_cache/backend_impl.cc

Index: net/disk_cache/backend_impl.cc
diff --git a/net/disk_cache/backend_impl.cc b/net/disk_cache/backend_impl.cc
index 3b2a4ca76d76b0ff64df9b31ca864b0c464b8ad3..ed69dcd4a6f57d3bbec25e085b9adc49eee14f0f 100644
--- a/net/disk_cache/backend_impl.cc
+++ b/net/disk_cache/backend_impl.cc
@@ -472,7 +472,7 @@ int BackendImpl::SyncInit() {
     trace_object_ = TraceObject::GetTraceObject();
     // Create a recurrent timer of 30 secs.
     int timer_delay = unit_test_ ? 1000 : 30000;
-    timer_.Start(FROM_HERE, TimeDelta::FromMilliseconds(timer_delay), this,
+    timer_.Start(TimeDelta::FromMilliseconds(timer_delay), this,
                  &BackendImpl::OnStatsTimer);
   }