Different approach to fixing file to URI mapping.

pkg/analyzer/lib/src/generated/sdk.dart

Index: pkg/analyzer/lib/src/generated/sdk.dart
diff --git a/pkg/analyzer/lib/src/generated/sdk.dart b/pkg/analyzer/lib/src/generated/sdk.dart
index 51c6ccccd47b8983ef56a73dd92779f88d7890b1..7319a7233a5f3ba31262f89908cbac25cd2cd357 100644
--- a/pkg/analyzer/lib/src/generated/sdk.dart
+++ b/pkg/analyzer/lib/src/generated/sdk.dart
@@ -142,8 +142,8 @@ class LibraryMap {
   /**
    * A table mapping Dart library URI's to the library.
    */
-  HashMap<String, SdkLibraryImpl> _libraryMap =
-      new HashMap<String, SdkLibraryImpl>();
+  LinkedHashMap<String, SdkLibraryImpl> _libraryMap =
+      new LinkedHashMap<String, SdkLibraryImpl>();
 
   /**
    * Return a list containing all of the sdk libraries in this mapping.
@@ -153,7 +153,7 @@ class LibraryMap {
   /**
    * Return a list containing the library URI's for which a mapping is available.
    */
-  List<String> get uris => new List.from(_libraryMap.keys.toSet());
+  List<String> get uris => _libraryMap.keys.toList();
 
   /**
    * Return the library with the given 'dart:' [uri], or `null` if the URI does