Make getKeys, getValues getters (keys, values).

lib/compiler/implementation/js_backend/backend.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.
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
   List<Element> compiledFunctions;
 
@@ skipping 404 matching lines @@
       optimizedStaticFunctions[field].add(element);
     } else {
       optimizedFunctions.putIfAbsent(
           field, () => new FunctionSet(backend.compiler));
       optimizedFunctions[field].add(element);
     }
   }
 
   void dump() {
     Set<Element> allFields = new Set<Element>();
-    fieldInitializerTypeMap.getKeys().forEach(allFields.add);
-    fieldConstructorTypeMap.getKeys().forEach(allFields.add);
-    fieldTypeMap.getKeys().forEach(allFields.add);
+    fieldInitializerTypeMap.keys.forEach(allFields.add);
+    fieldConstructorTypeMap.keys.forEach(allFields.add);
+    fieldTypeMap.keys.forEach(allFields.add);
     allFields.forEach((Element field) {
       print("Inferred $field has type ${optimisticFieldType(field)}");
     });
   }
 }
 
 class ArgumentTypesRegistry {
   final JavaScriptBackend backend;
 
   /**
@@ skipping 507 matching lines @@
     print("Inferred return types:");
     print("----------------------");
     dumpReturnTypes();
     print("");
     print("Inferred field types:");
     print("------------------------");
     fieldTypes.dump();
     print("");
   }
 }