Move Time, TimeDelta and TimeTicks into namespace base.

chrome/browser/metrics_log.cc

Index: chrome/browser/metrics_log.cc
===================================================================
--- chrome/browser/metrics_log.cc	(revision 3954)
+++ chrome/browser/metrics_log.cc	(working copy)
@@ -20,6 +20,9 @@
 
 #define OPEN_ELEMENT_FOR_SCOPE(name) ScopedElement scoped_element(this, name)
 
+using base::Time;
+using base::TimeDelta;
+
 // libxml take xmlChar*, which is unsigned char*
 inline const unsigned char* UnsignedChar(const char* input) {
   return reinterpret_cast<const unsigned char*>(input);
@@ -642,4 +645,3 @@
     }
   }
 }
-