Use NS_LITERAL_STRING instead of NS_ConvertASCIItoUCS2 where possible

(i.e. where the string is a literal).  Bug 104159, r=jag, sr=alecf

parser/htmlparser/src/nsViewSourceHTML.cpp

@@ -1182,7 +1182,7 @@ NS_IMETHODIMP CViewSourceHTML::HandleToken(CToken* aToken,nsIParser* aParser) {
           // Fix bug 40809
           nsAutoString theStr;
           aToken->GetSource(theStr);
-          theStr.ReplaceSubstring(NS_ConvertASCIItoUCS2("\r\n"), NS_ConvertASCIItoUCS2("\n"));
+          theStr.ReplaceSubstring(NS_LITERAL_STRING("\r\n").get(), NS_LITERAL_STRING("\n").get());
           theStr.ReplaceChar(kCR,kLF);  
           result=WriteTag(mText,theStr,aToken->GetAttributeCount(),PR_TRUE);
         }