Remove show clauses for types that moved to other libraries.

pkg/analyzer/lib/src/generated/element.dart

 // Copyright (c) 2014, 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 engine.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/task/dart.dart';
-import 'package:analyzer/task/model.dart'
-    show AnalysisTarget, ConstantEvaluationTarget;
+import 'package:analyzer/task/model.dart' show AnalysisTarget;
 
 import 'ast.dart';
 import 'constant.dart' show DartObject, EvaluationResultImpl;
-import 'engine.dart' show AnalysisContext, AnalysisEngine, AnalysisException;
+import 'engine.dart' show AnalysisContext, AnalysisEngine;
 import 'html.dart' show XmlAttributeNode, XmlTagNode;
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'resolver.dart';
 import 'scanner.dart' show Keyword;
 import 'sdk.dart' show DartSdk;
 import 'source.dart';
 import 'utilities_collection.dart';
 import 'utilities_dart.dart';
 
@@ skipping 11293 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }