Move Time, TimeDelta and TimeTicks into namespace base.

chrome/browser/cache_manager_host.h

Index: chrome/browser/cache_manager_host.h
===================================================================
--- chrome/browser/cache_manager_host.h	(revision 3954)
+++ chrome/browser/cache_manager_host.h	(working copy)
@@ -68,12 +68,12 @@
 
  protected:
   // The amount of idle time before we consider a tab to be "inactive"
-  static const TimeDelta kRendererInactiveThreshold;
+  static const base::TimeDelta kRendererInactiveThreshold;
 
   // Keep track of some renderer information.
   struct RendererInfo : CacheManager::UsageStats {
     // The access time for this renderer.
-    Time access;
+    base::Time access;
   };
 
   typedef std::map<int, RendererInfo> StatsMap;