Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.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.
 
 library mirrors_dart2js;
 
 import 'dart:async';
 import 'dart:collection' show LinkedHashMap;
 import 'dart:io' show Path;
 import 'dart:uri';
@@ skipping 69 matching lines @@
     return new Dart2JsVoidMirror(system, type);
   } else if (type is TypedefType) {
     return new Dart2JsTypedefMirror(system, type);
   } else if (type is MalformedType) {
     // TODO(johnniwinther): We need a mirror on malformed types.
     return system.dynamicType;
   }
   system.compiler.internalError("Unexpected type $type of kind ${type.kind}");
 }
 
-Collection<Dart2JsMemberMirror> _convertElementMemberToMemberMirrors(
+Iterable<Dart2JsMemberMirror> _convertElementMemberToMemberMirrors(
     Dart2JsContainerMirror library, Element element) {
   if (element.isSynthesized) {
     return const <Dart2JsMemberMirror>[];
   } else if (element is VariableElement) {
     return <Dart2JsMemberMirror>[new Dart2JsFieldMirror(library, element)];
   } else if (element is FunctionElement) {
     return <Dart2JsMemberMirror>[new Dart2JsMethodMirror(library, element)];
   } else if (element is AbstractFieldElement) {
     var members = <Dart2JsMemberMirror>[];
     if (element.getter != null) {
@@ skipping 1547 matching lines @@
       for (StringConstant keyConstant in _constant.keys.entries) {
         _listCache[index] = keyConstant.value.slowToString();
         index++;
       }
     }
     return _listCache;
   }
 
   int get length => _constant.length;
 
-  Collection<String> get keys {
+  Iterable<String> get keys {
     // TODO(johnniwinther): Return an unmodifiable list instead.
     return new List<String>.from(_list);
   }
 
   Future<InstanceMirror> operator[](String key) {
     int index = _list.indexOf(key);
     if (index == -1) return null;
     return new Future<InstanceMirror>.immediate(
         _convertConstantToInstanceMirror(mirrors, _constant.values[index]));
   }
@@ skipping 82 matching lines @@
       return new Future.immediate(
           new Dart2JsStringConstantMirror.fromString(mirrors, text));
     } else if (fieldName == 'trimmedText') {
       return new Future.immediate(
           new Dart2JsStringConstantMirror.fromString(mirrors, trimmedText));
     }
     // TODO(johnniwinther): Which exception/error should be thrown here?
     throw new UnsupportedError('InstanceMirror does not have a reflectee');
   }
 }