Removed NS_BASE_STREAM_EOF in favor of returning a count of 0 from Read to indicate EOF. Renamed GetLength to Available. Fixed a number of places where AppendElement's broken error code wasn't checked.

git-svn-id: svn://10.0.0.236/trunk@46637 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/parser/htmlparser/tests/grabpage/grabpage.cpp

@@ -117,7 +117,7 @@ StreamToFile::OnDataAvailable(nsIURI* aURL, nsIInputStream *pIStream,
   do {
     char buffer[4000];
     nsresult err = pIStream->Read(buffer, 0, sizeof(buffer), &len);
-    if (err == NS_OK) {
+    if (NS_SUCCEEDED(err)) {
       if (nsnull != mFile) {
         fwrite(buffer, 1, len, mFile);
       }