Add functions to clean URLs from the activity log

chrome/browser/extensions/activity_log/activity_log_policy.h

Index: chrome/browser/extensions/activity_log/activity_log_policy.h
diff --git a/chrome/browser/extensions/activity_log/activity_log_policy.h b/chrome/browser/extensions/activity_log/activity_log_policy.h
index a0d3472860d3b56eb01476ea4e2248f0fe89242e..be8f5e1490a927f3de960027333bcd0d5a8437ba 100644
--- a/chrome/browser/extensions/activity_log/activity_log_policy.h
+++ b/chrome/browser/extensions/activity_log/activity_log_policy.h
@@ -38,6 +38,7 @@ class Extension;
 // (1) Receiving Actions to process, and summarizing, compression, and storing
 //     these as appropriate.
 // (2) Reading Actions back from storage.
+// (3) Cleaning of URLs
 //
 // Implementations based on a database should likely implement
 // ActivityDatabase::Delegate, which provides hooks on database events and
@@ -87,6 +88,10 @@ class ActivityLogPolicy {
       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;
+
   // For unit testing only.
   void SetClockForTesting(scoped_ptr<base::Clock> clock);