Bug#169292(text indentation of <li> elements not corrent for final element)

Patch:t_mutreja@yahoo.com, r= akkana, sr=heikki

content/base/src/nsPlainTextSerializer.cpp

@@ -864,6 +864,7 @@ nsPlainTextSerializer::DoCloseContainer(PRInt32 aTag)
     mLineBreakDue = PR_TRUE;
   }
   else if (type == eHTMLTag_ul) {
+    FlushLine();
     mIndent -= kIndentSizeList;
     if (--mULCount + mOLStackIndex == 0) {
       mFloatingLines = 1;