Consolidate analyzer dependencies.

pkg/front_end/lib/src/fasta/analyzer/analyzer_target.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.analyzer_target;
+
+import 'package:kernel/ast.dart' show Library, Source;
+
+import '../kernel/kernel_target.dart' show KernelTarget;
+
+import '../translate_uri.dart' show TranslateUri;
+
+import '../dill/dill_target.dart' show DillTarget;
+
+import 'analyzer_loader.dart' show AnalyzerLoader;
+
+class AnalyzerTarget extends KernelTarget {
+  AnalyzerTarget(DillTarget dillTarget, TranslateUri uriTranslator,
+      [Map<String, Source> uriToSource])
+      : super(dillTarget, uriTranslator, uriToSource);
+
+  @override
+  AnalyzerLoader<Library> createLoader() => new AnalyzerLoader<Library>(this);
+}