Add deletion to the activityLogPrivate API

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 b48dd628ff53d95cfc1af4f8073b769b344d1479..ec8a2e508bbfbfd30bf4b9aad2547f4bbe914149 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;
 
+  // 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;
@@ -91,6 +94,9 @@ class CountingPolicy : public ActivityLogDatabasePolicy {
   // thread.
   void DoRemoveURLs(const std::vector<GURL>& restrict_urls);
 
+  // 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);