Change HashMap declarations back to Map.

pkg/analysis_server/lib/src/package_map_provider.dart

Index: pkg/analysis_server/lib/src/package_map_provider.dart
diff --git a/pkg/analysis_server/lib/src/package_map_provider.dart b/pkg/analysis_server/lib/src/package_map_provider.dart
index 29ec5ce6fb3765ea7d950b9aa60076fc615bb526..8693a2894aa8693b06bc25ebff2a5e51c25be8e2 100644
--- a/pkg/analysis_server/lib/src/package_map_provider.dart
+++ b/pkg/analysis_server/lib/src/package_map_provider.dart
@@ -38,7 +38,7 @@ class PackageMapInfo {
    *
    * `null` if an error occurred.
    */
-  HashMap<String, List<Folder>> packageMap;
+  Map<String, List<Folder>> packageMap;
 
   /**
    * Dependency information.  This is a set of the paths which were consulted
@@ -126,9 +126,9 @@ class PubPackageMapProvider implements PackageMapProvider {
     //     "path/to/myapp/pubspec.lock"
     //   ]
     // }
-    HashMap<String, List<Folder>> packageMap = new HashMap<String, List<Folder>>();
-    HashMap obj = JSON.decode(jsonText);
-    HashMap packages = obj['packages'];
+    Map<String, List<Folder>> packageMap = new HashMap<String, List<Folder>>();
+    Map obj = JSON.decode(jsonText);
+    Map packages = obj['packages'];
     processPaths(String packageName, List paths) {
       List<Folder> folders = <Folder>[];
       for (var path in paths) {