Revert "when silencing, blow scope for not-logged-in users"

This reverts commit 04f71a42.

classes/Profile.php

@@ -1139,20 +1139,11 @@ class Profile extends Managed_DataObject
     function silence()
     {
         $this->grantRole(Profile_role::SILENCED);
-        $this->blowRecentNoticeScope();
     }
 
     function unsilence()
     {
         $this->revokeRole(Profile_role::SILENCED);
-        $this->blowRecentNoticeScope();
-    }
-
-    function blowRecentNoticeScope() {
-        $notice = $this->getNotices(0, CachingNoticeStream::CACHE_WINDOW);
-        while ($notice->fetch()) {
-            self::blow(sprintf('notice:in-scope-for:%d:null', $notice->id));
-        }        
     }
 
     /**