Remove all deprecated fasta message methods from analyzer.

pkg/front_end/lib/src/fasta/problems.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.
+
+library fasta.problems;
+
+import 'messages.dart'
+    show
+        Message,
+        deprecated_format,
+        templateUnexpected,
+        templateUnhandled,
+        templateUnimplemented,
+        templateUnsupported;
+
+/// Used to report an internal error.
+///
+/// Internal errors should be avoided as best as possible, but are preferred
+/// over assertion failures. The message should contain a short description
+/// that may help a developer debug the issue.  This method should be called
+/// instead of using `throw`, as this allows us to ensure that there are no
+/// throws anywhere else in the codebase.
+dynamic internalProblem(Message message, int charOffset, Uri uri) {
+  String text = "Internal problem: ${message.message}";
+  if (uri == null && charOffset == -1) {
+    throw text;
+  } else {
+    throw deprecated_format(uri, charOffset, text);
+  }
+}
+
+dynamic unimplemented(String what, int charOffset, Uri uri) {
+  return internalProblem(
+      templateUnimplemented.withArguments(what), charOffset, uri);
+}
+
+dynamic unhandled(String what, String where, int charOffset, Uri uri) {
+  return internalProblem(
+      templateUnhandled.withArguments(what, where), charOffset, uri);
+}
+
+dynamic unexpected(String expected, String actual, int charOffset, Uri uri) {
+  return internalProblem(
+      templateUnexpected.withArguments(expected, actual), charOffset, uri);
+}
+
+dynamic unsupported(String operation, int charOffset, Uri uri) {
+  return internalProblem(
+      templateUnsupported.withArguments(operation), charOffset, uri);
+}