get mark all read to work for news. fixes #11104. use the implementation in the base class.

mailnews/db/msgdb/public/nsNewsDatabase.h

@@ -49,7 +49,6 @@ public:
   NS_IMETHOD				IsRead(nsMsgKey key, PRBool *pRead);
 
   virtual PRBool			IsArticleOffline(nsMsgKey key);
-  NS_IMETHOD				MarkAllRead(nsMsgKeyArray *thoseMarked = NULL);
   virtual nsresult          AddHdrFromXOver(const char * line,  nsMsgKey *msgId);
   NS_IMETHOD				AddHdrToDB(nsMsgHdr *newHdr, PRBool *newThread, PRBool notify = PR_FALSE);
   

mailnews/db/msgdb/src/nsNewsDatabase.cpp

@@ -248,10 +248,6 @@ PRBool nsNewsDatabase::IsArticleOffline(nsMsgKey key)
 	return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-nsresult		nsNewsDatabase::MarkAllRead(nsMsgKeyArray *thoseMarked)
-{
-	return NS_ERROR_NOT_IMPLEMENTED;
-}
 nsresult		nsNewsDatabase::AddHdrFromXOver(const char * line,  nsMsgKey *msgId)
 {
 	return NS_ERROR_NOT_IMPLEMENTED;