Remove activity_log's Util::DropObsoleteTables().

chrome/browser/extensions/activity_log/activity_log_policy.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_POLICY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 102 matching lines @@
     static base::Time AddDays(const base::Time& base_date, int days);
 
     // Compute the time bounds that should be used for a database query to
     // cover a time range days_ago days in the past, relative to the specified
     // time.
     static void ComputeDatabaseTimeBounds(const base::Time& now,
                                           int days_ago,
                                           int64_t* early_bound,
                                           int64_t* late_bound);
 
-    // Deletes obsolete database tables from an activity log database.  This
-    // can be used in InitDatabase() methods of ActivityLogDatabasePolicy
-    // subclasses to clean up data from old versions of the activity logging
-    // code.  Returns true on success, false on database error.
-    static bool DropObsoleteTables(sql::Connection* db);
-
    private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(Util);
   };
 
  protected:
   // An ActivityLogPolicy is not directly destroyed.  Instead, call Close()
   // which will cause the object to be deleted when it is safe.
   virtual ~ActivityLogPolicy();
 
   // Returns Time::Now() unless a mock clock has been installed with
@@ skipping 93 matching lines @@
  private:
   // See the comments for the ActivityDatabase class for a discussion of how
   // database cleanup runs.
   ActivityDatabase* db_;
   base::FilePath database_path_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_POLICY_H_