Reapply "Rename mappedBy to map."

sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index 0eda87642004c790e7bfd5ccf8b4783028d216ce..f2e4f8fd6e361216d7741825ab748efc3789ba4b 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -1849,7 +1849,7 @@ $lazyInitializerLogic
       }
 
       List<js.Expression> argNames =
-          selector.getOrderedNamedArguments().mappedBy((SourceString name) =>
+          selector.getOrderedNamedArguments().map((SourceString name) =>
               js.string(name.slowToString())).toList();
 
       String internalName = namer.invocationMirrorInternalName(selector);
@@ -1870,7 +1870,7 @@ $lazyInitializerLogic
                           js.string(internalName),
                           new js.LiteralNumber('$type'),
                           new js.ArrayInitializer.from(
-                              parameters.mappedBy((param) => js.use(param.name))
+                              parameters.map((param) => js.use(param.name))
                                         .toList()),
                           new js.ArrayInitializer.from(argNames)])]);
       js.Expression function =