Switch FE to use the libraries.json format.

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 505f593abaa7b2f573ee9ec65fc0a3dd1c191796..cb4572fb28e3919fd58e941e6f1942142cecb0d8 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -2489,6 +2489,27 @@ Message _withArgumentsSdkRootNotFound(Uri uri_) {
       arguments: {'uri': uri_});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<Message Function(Uri uri_)> templateSdkSpecificationNotFound =
+    const Template<Message Function(Uri uri_)>(
+        messageTemplate: r"""SDK libraries specification not found: #uri.""",
+        withArguments: _withArgumentsSdkSpecificationNotFound);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(Uri uri_)> codeSdkSpecificationNotFound =
+    const Code<Message Function(Uri uri_)>(
+  "SdkSpecificationNotFound",
+  templateSdkSpecificationNotFound,
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsSdkSpecificationNotFound(Uri uri_) {
+  String uri = relativizeUri(uri_);
+  return new Message(codeSdkSpecificationNotFound,
+      message: """SDK libraries specification not found: $uri.""",
+      arguments: {'uri': uri_});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Template<Message Function(Uri uri_)> templateSdkSummaryNotFound =
     const Template<Message Function(Uri uri_)>(