Remove activity_log's Util::DropObsoleteTables().

chrome/browser/extensions/activity_log/counting_policy.cc

Index: chrome/browser/extensions/activity_log/counting_policy.cc
diff --git a/chrome/browser/extensions/activity_log/counting_policy.cc b/chrome/browser/extensions/activity_log/counting_policy.cc
index fec6284c523408df2568be33f707ebfbb41f1c49..d594657640759467a870a0d06e9ebe69855f8798 100644
--- a/chrome/browser/extensions/activity_log/counting_policy.cc
+++ b/chrome/browser/extensions/activity_log/counting_policy.cc
@@ -179,9 +179,6 @@ CountingPolicy::CountingPolicy(Profile* profile)
 CountingPolicy::~CountingPolicy() {}
 
 bool CountingPolicy::InitDatabase(sql::Connection* db) {
-  if (!Util::DropObsoleteTables(db))
-    return false;
-
   if (!string_table_.Initialize(db))
     return false;
   if (!url_table_.Initialize(db))