Move Time, TimeDelta and TimeTicks into namespace base.

base/field_trial.h

Index: base/field_trial.h
===================================================================
--- base/field_trial.h	(revision 3954)
+++ base/field_trial.h	(working copy)
@@ -70,7 +70,7 @@
   // of the application.  In some experiments it may be useful to discount
   // data that is gathered before the application has reach sufficient
   // stability (example: most DLL have loaded, etc.)
-  static Time application_start_time() {
+  static base::Time application_start_time() {
     return global_->application_start_time_;
   }
 
@@ -83,7 +83,7 @@
   static FieldTrialList* global_;  // The singleton of this class.
   static int constructor_count_;   // Prevent having more than one.
 
-  Time application_start_time_;
+  base::Time application_start_time_;
   RegistrationList registered_;
 
   DISALLOW_COPY_AND_ASSIGN(FieldTrialList);