Changed NS_ERROR_UENC_NOMAPPING to non serious error and return it to clients of nsISaveAsCharset, r=cata.

intl/uconv/public/nsIUnicodeEncoder.h

@@ -48,7 +48,7 @@ static NS_DEFINE_IID(kIUnicharEncoderIID, NS_IUNICHARENCODER_IID);
   NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x22)
 
 #define NS_ERROR_UENC_NOMAPPING     \
-  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_UCONV, 0x23)
+  NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x23)
 
 
 #define NS_UNICODEENCODER_PROGID_BASE "component://netscape/intl/unicode/encoder?charset="

intl/unicharutil/src/nsSaveAsCharset.cpp

@@ -246,7 +246,7 @@ nsSaveAsCharset::DoCharsetConversion(const PRUnichar *inString, char **outString
   *outString = dstPtr;      // set the result string
 
   // set error code so that the caller can do own fall back
-  if ((NS_ERROR_UENC_NOMAPPING == saveResult) && ATTR_NO_FALLBACK(mAttribute)) {
+  if (NS_ERROR_UENC_NOMAPPING == saveResult) {
     rv = NS_ERROR_UENC_NOMAPPING;
   }