Switch FE to use the libraries.json format.

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

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/front_end/messages.yaml' and run
 // 'pkg/front_end/tool/_fasta/generate_messages.dart' to update.
 
 part of fasta.codes;
@@ skipping 2472 matching lines @@
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 Message _withArgumentsSdkRootNotFound(Uri uri_) {
   String uri = relativizeUri(uri_);
   return new Message(codeSdkRootNotFound,
       message: """SDK root directory not found: $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_)>(
         messageTemplate: r"""SDK summary not found: #uri.""",
         withArguments: _withArgumentsSdkSummaryNotFound);
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Message Function(Uri uri_)> codeSdkSummaryNotFound =
     const Code<Message Function(Uri uri_)>(
   "SdkSummaryNotFound",
   templateSdkSummaryNotFound,
@@ skipping 500 matching lines @@
         r"""'yield' can't be used as an identifier in 'async', 'async*', or 'sync*' methods.""");
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeYieldNotGenerator = messageYieldNotGenerator;
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const MessageCode messageYieldNotGenerator = const MessageCode(
     "YieldNotGenerator",
     dart2jsCode: "*ignored*",
     message: r"""'yield' can only be used in 'sync*' or 'async*' methods.""");