fix 267483 regression in clearing of new flag when mail is filtered into pop3 folder, sr=mscott

mail/base/content/commandglue.js

@@ -312,9 +312,7 @@ function RerootFolder(uri, newFolder, viewType, viewFlags, sortType, sortOrder)
   //Clear the new messages of the old folder
   var oldFolder = gPrevSelectedFolder;
   if (oldFolder) {
-    if (oldFolder.hasNewMessages) {
-      oldFolder.clearNewMessages();
-    }
+    oldFolder.clearNewMessages();
     oldFolder.hasNewMessages = false;
   }
 

mail/base/content/mailCommands.js

@@ -45,9 +45,7 @@ function GetNewMessages(selectedFolders, server, compositeDataSource)
 		{
 			var nsIMsgFolder = Components.interfaces.nsIMsgFolder;
 			msgFolder.biffState = nsIMsgFolder.nsMsgBiffState_NoMail;
-
-			if (msgFolder.hasNewMessages)
-				msgFolder.clearNewMessages();
+			msgFolder.clearNewMessages();
 		}
 		
 		if(compositeDataSource)

mail/base/content/mailWindowOverlay.js

@@ -1939,9 +1939,7 @@ function CoalesceGetMsgsForPop3ServersByDestFolder(currentServer, pop3DownloadSe
     if(inboxFolder) 
     {
       inboxFolder.biffState =  Components.interfaces.nsIMsgFolder.nsMsgBiffState_NoMail;
-
-      if (inboxFolder.hasNewMessages)
-        inboxFolder.clearNewMessages();
+      inboxFolder.clearNewMessages();
     }
     localFoldersToDownloadTo.AppendElement(inboxFolder);
     index = pop3DownloadServersArray.length