diff --git a/mozilla/xpcom/string/src/nsReadableUtils.cpp b/mozilla/xpcom/string/src/nsReadableUtils.cpp
index 9fa1dbf8dd7..e2cb5518b72 100755
--- a/mozilla/xpcom/string/src/nsReadableUtils.cpp
+++ b/mozilla/xpcom/string/src/nsReadableUtils.cpp
@@ -150,30 +150,16 @@ NS_COM
 void
 LossyCopyUTF16toASCII( const nsAString& aSource, nsACString& aDest )
   {
-    aDest.SetLength(aSource.Length());
-
-    nsAString::const_iterator fromBegin, fromEnd;
-
-      // right now, this won't work on multi-fragment destinations
-    nsACString::iterator toBegin;
-    LossyConvertEncoding<PRUnichar, char> converter(aDest.BeginWriting(toBegin).get());
-
-    copy_string(aSource.BeginReading(fromBegin), aSource.EndReading(fromEnd), converter);
+    aDest.Truncate();
+    LossyAppendUTF16toASCII(aSource, aDest);
   }
 
 NS_COM
 void
 CopyASCIItoUTF16( const nsACString& aSource, nsAString& aDest )
   {
-    aDest.SetLength(aSource.Length());
-
-    nsACString::const_iterator fromBegin, fromEnd;
-
-      // right now, this won't work on multi-fragment destinations
-    nsAString::iterator toBegin;
-    LossyConvertEncoding<char, PRUnichar> converter(aDest.BeginWriting(toBegin).get());
-
-    copy_string(aSource.BeginReading(fromBegin), aSource.EndReading(fromEnd), converter);
+    aDest.Truncate();
+    AppendASCIItoUTF16(aSource, aDest);
   }
 
 NS_COM