Move Time, TimeDelta and TimeTicks into namespace base.

net/url_request/url_request_job_metrics.h

Index: net/url_request/url_request_job_metrics.h
===================================================================
--- net/url_request/url_request_job_metrics.h	(revision 3954)
+++ net/url_request/url_request_job_metrics.h	(working copy)
@@ -28,10 +28,10 @@
   scoped_ptr<GURL> url_;
 
   // Time when the job starts.
-  TimeTicks start_time_;
+  base::TimeTicks start_time_;
 
   // Time when the job is done.
-  TimeTicks end_time_;
+  base::TimeTicks end_time_;
 
   // Total number of bytes the job reads from underline IO.
   int total_bytes_read_;