fix 301065, crash when shutting down when tb progress history extension is installed, sr=mscott, a=asa

mailnews/local/src/nsPop3Protocol.cpp

@@ -623,8 +623,6 @@ nsPop3Protocol::~nsPop3Protocol()
 
   net_pop3_free_state(m_pop3ConData->uidlinfo);
     
-  UpdateProgressPercent(0, 0);
-  
   FreeMsgInfo(); 
   PR_Free(m_pop3ConData->only_uidl);
   PR_Free(m_pop3ConData);