feat(dart/transform): Fix handling of Dart keywords

Use `package:analyzer`'s list of Dart keywords to ensure we are properly
reporting usages of Dart keywords as runtime errors.

modules/angular2/test/transform/bind_generator/basic_bind_files/expected/bar.ng_deps.dart

@@ -16,5 +16,5 @@ void initReflector(reflector) {
             selector: '[tool-tip]', properties: const {'text': 'tool-tip'})
       ]
     })
-    ..registerSetters({'text': (o, String v) => o.text = v});
+    ..registerSetters({'text': (o, v) => o.text = v});
 }

modules/angular2/test/transform/bind_generator/duplicate_bind_name_files/expected/soup.ng_deps.dart

@@ -22,5 +22,5 @@ void initReflector(reflector) {
       'parameters': const [],
       'annotations': const [const Component(properties: const {'menu': 'menu'})]
     })
-    ..registerSetters({'menu': (o, String v) => o.menu = v});
+    ..registerSetters({'menu': (o, v) => o.menu = v});
 }