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

chrome/browser/extensions/activity_log/fullstream_ui_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_FULLSTREAM_UI_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_
 
 #include <string>
 
 #include "chrome/browser/extensions/activity_log/activity_database.h"
@@ skipping 25 matching lines @@
       const std::string& arg_url,
       const int days_ago,
       const base::Callback
           <void(scoped_ptr<Action::ActionVector>)>& callback) OVERRIDE;
 
   virtual void Close() OVERRIDE;
 
   // Clean the URL data stored for this policy.
   virtual void RemoveURLs(const std::vector<GURL>& restrict_urls) 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;
 
   // Database table schema.
   static const char* kTableName;
   static const char* kTableContentFields[];
   static const char* kTableFieldTypes[];
   static const int kTableFieldCount;
 
  protected:
@@ skipping 11 matching lines @@
   // Strips arguments if needed by policy.  May return the original object (if
   // unmodified), or a copy (if modifications were made).  The implementation
   // in FullStreamUIPolicy returns the action unmodified.
   virtual scoped_refptr<Action> ProcessArguments(
       scoped_refptr<Action> action) const;
 
   // 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; this must only run on the database
   // thread.
   void DoDeleteDatabase();
 
   // Tracks any pending updates to be written to the database, if write
   // batching is turned on.  Should only be accessed from the database thread.
   Action::ActionVector queued_actions_;
 
  private:
   // Adds an Action to queued_actions_; this should be invoked only on the
   // database thread.
   void QueueAction(scoped_refptr<Action> action);
 
   // Internal method to read data from the database; called on the database
   // thread.
   scoped_ptr<Action::ActionVector> DoReadFilteredData(
       const std::string& extension_id,
       const Action::ActionType type,
       const std::string& api_name,
       const std::string& page_url,
       const std::string& arg_url,
       const int days_ago);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_