All strong mode cleaning of dart2js.

pkg/compiler/lib/src/resolution/member_impl.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js.resolution.compute_members;
 
 class DeclaredMember implements Member {
   final Name name;
-  final Element element;
+  final MemberElement element;
   final ResolutionInterfaceType declarer;
   final ResolutionDartType type;
   final ResolutionFunctionType functionType;
 
   DeclaredMember(
       this.name, this.element, this.declarer, this.type, this.functionType);
 
   bool get isStatic => !element.isInstanceMember;
 
   bool get isGetter => element.isGetter || (!isSetter && element.isField);
@@ skipping 89 matching lines @@
 class InheritedMember implements DeclaredMember {
   final DeclaredMember declaration;
   final ResolutionInterfaceType instance;
 
   InheritedMember(
       DeclaredMember this.declaration, ResolutionInterfaceType this.instance) {
     assert(instance.isGeneric);
     assert(!declaration.isStatic);
   }
 
-  Element get element => declaration.element;
+  MemberElement get element => declaration.element;
 
   Name get name => declaration.name;
 
   ResolutionInterfaceType get declarer => instance;
 
   bool get isStatic => false;
 
   bool get isSetter => declaration.isSetter;
 
   bool get isGetter => declaration.isGetter;
@@ skipping 117 matching lines @@
 
   bool get isGetter => false;
 
   bool get isMethod => false;
 
   bool get isMalformed => true;
 
   String toString() => "erroneous member '$name' synthesized "
       "from ${inheritedMembers}";
 }