Calculator should not underestimate converter. b=241440 Patch from <wind.li@sun.com>. r=dbaron sr=dveditz a=dveditz

xpcom/string/public/nsUTF8Utils.h

@@ -263,7 +263,6 @@ class CalculateUTF8Length
           {
             NS_ERROR("Not a UTF-8 string. This code should only be used for converting from known UTF-8 strings.");
             mErrorEncountered = PR_TRUE;
-            mLength = 0;
             return N;
           }
         return p - start;