Revert 124890 - Convert uses of int ms to TimeDelta in chrome/browser and net.

chrome/browser/metrics/metrics_service.cc

Index: chrome/browser/metrics/metrics_service.cc
===================================================================
--- chrome/browser/metrics/metrics_service.cc	(revision 124890)
+++ chrome/browser/metrics/metrics_service.cc	(working copy)
@@ -834,7 +834,7 @@
         base::Bind(&MetricsService::InitTaskGetHardwareClass,
             self_ptr_factory_.GetWeakPtr(),
             MessageLoop::current()->message_loop_proxy()),
-        base::TimeDelta::FromSeconds(kInitializationDelaySeconds));
+        kInitializationDelaySeconds);
   }
 }
 
@@ -943,7 +943,7 @@
   // calling us back on the task.
   HistogramSynchronizer::FetchRendererHistogramsAsynchronously(
       MessageLoop::current(), callback,
-      base::TimeDelta::FromMilliseconds(kMaxHistogramGatheringWaitDuration));
+      kMaxHistogramGatheringWaitDuration);
 }
 
 void MetricsService::OnHistogramSynchronizationDone() {