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

chrome/browser/extensions/activity_log/counting_policy.h

Index: chrome/browser/extensions/activity_log/counting_policy.h
diff --git a/chrome/browser/extensions/activity_log/counting_policy.h b/chrome/browser/extensions/activity_log/counting_policy.h
index 3baa41a102dc1fd26e75b6f8b622babe9e3775c0..523bb47f16f320abf163dbcae8751fdf25595b2e 100644
--- a/chrome/browser/extensions/activity_log/counting_policy.h
+++ b/chrome/browser/extensions/activity_log/counting_policy.h
@@ -48,6 +48,9 @@ class CountingPolicy : public ActivityLogDatabasePolicy {
   // 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;
 
@@ -89,6 +92,10 @@ class CountingPolicy : public ActivityLogDatabasePolicy {
   // 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();