Reapply "Rename mappedBy to map."

sdk/lib/_internal/compiler/implementation/lib/js_array.dart

Index: sdk/lib/_internal/compiler/implementation/lib/js_array.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/js_array.dart b/sdk/lib/_internal/compiler/implementation/lib/js_array.dart
index 4bd608853c589ced5b44801fd8c8cb9e8159c5af..34915910c2451b96fb45186241cf5d0359f56947 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/js_array.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/js_array.dart
@@ -84,6 +84,10 @@ class JSArray<E> implements List<E> {
     return IterableMixinWorkaround.forEach(this, f);
   }
 
+  Iterable map(f(E element)) {
+    return IterableMixinWorkaround.map(this, f);
+  }
+
   List mappedBy(f(E element)) {
     return IterableMixinWorkaround.mappedByList(this, f);
   }
@@ -97,7 +101,7 @@ class JSArray<E> implements List<E> {
     return JS('String', "#.join(#)", list, separator);
   }
 
-  List<E> take(int n) {
+  Iterable<E> take(int n) {
     return IterableMixinWorkaround.takeList(this, n);
   }
 
@@ -105,7 +109,7 @@ class JSArray<E> implements List<E> {
     return IterableMixinWorkaround.takeWhile(this, test);
   }
 
-  List<E> skip(int n) {
+  Iterable<E> skip(int n) {
     return IterableMixinWorkaround.skipList(this, n);
   }