Make getKeys, getValues getters (keys, values).

lib/compiler/implementation/library_loader.dart

Index: lib/compiler/implementation/library_loader.dart
diff --git a/lib/compiler/implementation/library_loader.dart b/lib/compiler/implementation/library_loader.dart
index e23723b3e97b27bbbd3ad0f01ccd90ac66ea8b43..2f296edbe1830a9a231e3afb698f02234748199d 100644
--- a/lib/compiler/implementation/library_loader.dart
+++ b/lib/compiler/implementation/library_loader.dart
@@ -501,7 +501,7 @@ class LibraryDependencyNode {
    */
   void registerInitialExports() {
     pendingExportSet.addAll(
-        library.localScope.getValues().filter((Element element) {
+        library.localScope.values.filter((Element element) {
           // At this point [localScope] only contains members so we don't need
           // to check for foreign or prefix elements.
           return !element.name.isPrivate();
@@ -512,7 +512,7 @@ class LibraryDependencyNode {
    * Registers the compute export scope with the node library.
    */
   void registerExports() {
-    library.setExports(exportScope.getValues());
+    library.setExports(exportScope.values);
   }
 
   /**