Move Time, TimeDelta and TimeTicks into namespace base.

chrome/browser/safe_browsing/safe_browsing_database.cc

Index: chrome/browser/safe_browsing/safe_browsing_database.cc
===================================================================
--- chrome/browser/safe_browsing/safe_browsing_database.cc	(revision 3954)
+++ chrome/browser/safe_browsing/safe_browsing_database.cc	(working copy)
@@ -13,6 +13,8 @@
 #include "chrome/common/chrome_switches.h"
 #include "googleurl/src/gurl.h"
 
+using base::Time;
+
 // Filename suffix for the bloom filter.
 static const wchar_t kBloomFilterFile[] = L" Filter";
 
@@ -95,4 +97,3 @@
   SB_DLOG(INFO) << "SafeBrowsingDatabase wrote bloom filter in " <<
       (Time::Now() - before).InMilliseconds() << " ms";
 }
-