[Activity Log] when extension is uninstalled, delete data about it

chrome/browser/extensions/activity_log/counting_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_COUNTING_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_COUNTING_POLICY_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 30 matching lines @@
 
   // Gets or sets the amount of time that old records are kept in the database.
   const base::TimeDelta& retention_time() const { return retention_time_; }
   void set_retention_time(const base::TimeDelta& delta) {
     retention_time_ = delta;
   }
 
   // Clean the URL data stored for this policy.
   virtual void RemoveURLs(const std::vector<GURL>&) OVERRIDE;
 
+  // Clean the data related to this extension for this policy.
+  virtual void RemoveExtensionData(const std::string& extension_id) OVERRIDE;
+
   // Delete everything in the database.
   virtual void DeleteDatabase() OVERRIDE;
 
   // The main database table, and the name for a read-only view that
   // decompresses string values for easier parsing.
   static const char* kTableName;
   static const char* kReadViewName;
 
  protected:
   // The ActivityDatabase::Delegate interface.  These are always called from
@@ skipping 21 matching lines @@
       const Action::ActionType type,
       const std::string& api_name,
       const std::string& page_url,
       const std::string& arg_url,
       const int days_ago);
 
   // The implementation of RemoveURLs; this must only run on the database
   // thread.
   void DoRemoveURLs(const std::vector<GURL>& restrict_urls);
 
+  // The implementation of RemoveExtensionData; this must only run on the
+  // database thread.
+  void DoRemoveExtensionData(const std::string& extension_id);
+
   // The implementation of DeleteDatabase; called on the database thread.
   void DoDeleteDatabase();
 
   // Cleans old records from the activity log database.
   bool CleanOlderThan(sql::Connection* db, const base::Time& cutoff);
 
   // Cleans unused interned strings from the database.  This should be run
   // after deleting rows from the main log table to clean out stale values.
   bool CleanStringTables(sql::Connection* db);
 
@@ skipping 29 matching lines @@
 
   friend class CountingPolicyTest;
   FRIEND_TEST_ALL_PREFIXES(CountingPolicyTest, EarlyFlush);
   FRIEND_TEST_ALL_PREFIXES(CountingPolicyTest, MergingAndExpiring);
   FRIEND_TEST_ALL_PREFIXES(CountingPolicyTest, StringTableCleaning);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_COUNTING_POLICY_H_