Change HashMap declarations back to Map.

pkg/analysis_server/lib/src/computer/computer_outline.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 computer.outline;
 
-import 'dart:collection';
-
 import 'package:analysis_server/src/computer/element.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart' as engine;
 
 
 /**
  * A computer for [CompilationUnit] outline.
  */
 class DartUnitOutlineComputer {
   final CompilationUnit _unit;
 
   DartUnitOutlineComputer(this._unit);
 
   /**
    * Returns the computed outline, not `null`.
    */
-  HashMap<String, Object> compute() {
+  Map<String, Object> compute() {
     Outline unitOutline = _newUnitOutline();
     for (CompilationUnitMember unitMember in _unit.declarations) {
       if (unitMember is ClassDeclaration) {
         ClassDeclaration classDeclaration = unitMember;
         Outline classOutline = _newClassOutline(unitOutline, classDeclaration);
         for (ClassMember classMember in classDeclaration.members) {
           if (classMember is ConstructorDeclaration) {
             ConstructorDeclaration constructorDeclaration = classMember;
             _newConstructorOutline(classOutline, constructorDeclaration);
           }
@@ skipping 266 matching lines @@
    */
   final int length;
 
   /**
    * The offset of the first character of the element.
    */
   final int offset;
 
   Outline(this.element, this.offset, this.length);
 
-  factory Outline.fromJson(HashMap<String, Object> map) {
+  factory Outline.fromJson(Map<String, Object> map) {
     Element element = new Element.fromJson(map[ELEMENT]);
     Outline outline = new Outline(element, map[OFFSET], map[LENGTH]);
     // add children
-    List<HashMap<String, Object>> childrenMaps = map[CHILDREN];
+    List<Map<String, Object>> childrenMaps = map[CHILDREN];
     if (childrenMaps != null) {
       childrenMaps.forEach((childMap) {
         outline.children.add(new Outline.fromJson(childMap));
       });
     }
     // done
     return outline;
   }
 
-  HashMap<String, Object> toJson() {
-    HashMap<String, Object> json = {
+  Map<String, Object> toJson() {
+    Map<String, Object> json = {
       ELEMENT: element.toJson(),
       OFFSET: offset,
       LENGTH: length
     };
     if (children.isNotEmpty) {
       json[CHILDREN] = children.map((child) => child.toJson()).toList();
     }
     return json;
   }
 }
@@ skipping 16 matching lines @@
 
 
 /**
  * A range of characters.
  */
 class _SourceRegion {
   final int length;
   final int offset;
   _SourceRegion(this.offset, this.length);
 }