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

sdk/lib/_internal/compiler/implementation/dart_backend/renamer.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 dart_backend;
 
 Function get _compareNodes =>
     compareBy((n) => n.getBeginToken().charOffset);
 
 typedef String _Renamer(Renamable renamable);
@@ skipping 53 matching lines @@
 void renamePlaceholders(
     Compiler compiler,
     PlaceholderCollector placeholderCollector,
     Map<Node, String> renames,
     Map<LibraryElement, String> imports,
     Set<String> fixedMemberNames,
     bool cutDeclarationTypes) {
   final Map<LibraryElement, Map<String, String>> renamed
       = new Map<LibraryElement, Map<String, String>>();
 
-  renameNodes(Collection<Node> nodes, renamer) {
+  renameNodes(Iterable<Node> nodes, renamer) {
     for (Node node in sorted(nodes, _compareNodes)) {
       renames[node] = renamer(node);
     }
   }
 
   sortedForEach(Map<Element, dynamic> map, f) {
     for (Element element in sortElements(map.keys)) {
       f(element, map[element]);
     }
   }
@@ skipping 265 matching lines @@
     index ~/= firstCharAlphabet.length;
     int length = otherCharsAlphabet.length;
     while (index >= length) {
       resultBuilder.write(otherCharsAlphabet[index % length]);
       index ~/= length;
     }
     resultBuilder.write(otherCharsAlphabet[index]);
     return resultBuilder.toString();
   }
 }