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

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 <set>
 #include <string>
 
@@ skipping 74 matching lines @@
       const std::string& page_url,
       const std::string& arg_url,
       const int days_ago,
       const base::Callback
          <void(scoped_ptr<Action::ActionVector>)>& callback) = 0;
 
   // Clean the relevant URL data. The cleaning may need to be different for
   // different policies. If restrict_urls is empty then all URLs are removed.
   virtual void RemoveURLs(const std::vector<GURL>& restrict_urls) = 0;
 
+  // Remove all rows relating to a given extension.
+  virtual void RemoveExtensionData(const std::string& extension_id) = 0;
+
   // Deletes everything in the database.
   virtual void DeleteDatabase() = 0;
 
   // For unit testing only.
   void SetClockForTesting(scoped_ptr<base::Clock> clock);
 
   // A collection of methods that are useful for implementing policies.  These
   // are all static methods; the ActivityLogPolicy::Util class cannot be
   // instantiated.  This is nested within ActivityLogPolicy to make calling
   // these methods more convenient from within a policy, but they are public.
@@ skipping 107 matching lines @@
 
  private:
   // See the comments for the ActivityDatabase class for a discussion of how
   // database cleanup runs.
   ActivityDatabase* db_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_POLICY_H_