Deprecate the generated AST library and clean up imports

pkg/analyzer/lib/src/summary/summarize_elements.dart

 // Copyright (c) 2015, 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 serialization.elements;
 
 import 'dart:convert';
 
+import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/name_filter.dart';
 import 'package:analyzer/src/summary/summarize_const_expr.dart';
 import 'package:crypto/crypto.dart';
 
 /**
@@ skipping 558 matching lines @@
               numTypeParameters: 0));
         }
       }
       return bs;
     }
     return null;
   }
 
   CodeRangeBuilder serializeCodeRange(Element element) {
     if (element is ElementImpl && element.codeOffset != null) {
-      return new CodeRangeBuilder(offset: element.codeOffset, length: element.codeLength);
+      return new CodeRangeBuilder(
+          offset: element.codeOffset, length: element.codeLength);
     }
     return null;
   }
 
   /**
    * Serialize the given [combinator] into an [UnlinkedCombinator].
    */
   UnlinkedCombinatorBuilder serializeCombinator(
       NamespaceCombinator combinator) {
     UnlinkedCombinatorBuilder b = new UnlinkedCombinatorBuilder();
@@ skipping 975 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }