Revert "Remove check for scheme in source-loader."

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

Index: pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
index fd08b3f03d43986737a5ffa959c415413ba6412e..8a24755eb08f88ccfb22263f330151bd626f03dc 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -1669,27 +1669,6 @@ Message _withArgumentsInternalProblemUnsupported(String name) {
       arguments: {'name': name});
 }
 
-// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
-const Template<Message Function(Uri uri_)>
-    templateInternalProblemUriMissingScheme =
-    const Template<Message Function(Uri uri_)>(
-        messageTemplate: r"""The URI '#uri' has no scheme.""",
-        withArguments: _withArgumentsInternalProblemUriMissingScheme);
-
-// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
-const Code<Message Function(Uri uri_)> codeInternalProblemUriMissingScheme =
-    const Code<Message Function(Uri uri_)>(
-  "InternalProblemUriMissingScheme",
-  templateInternalProblemUriMissingScheme,
-);
-
-// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
-Message _withArgumentsInternalProblemUriMissingScheme(Uri uri_) {
-  String uri = relativizeUri(uri_);
-  return new Message(codeInternalProblemUriMissingScheme,
-      message: """The URI '$uri' has no scheme.""", arguments: {'uri': uri_});
-}
-
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Template<Message Function(String string)>
     templateInternalVerificationError =