Recommit changing List.skip/take/revert returns Iterable and remove mappedBy.

runtime/lib/array.dart

Index: runtime/lib/array.dart
diff --git a/runtime/lib/array.dart b/runtime/lib/array.dart
index 3ce453bba5e3625287e521949cf1ca9908b2a019..1441dc2a50e4b34a97de693994693f7f365f85ea 100644
--- a/runtime/lib/array.dart
+++ b/runtime/lib/array.dart
@@ -104,10 +104,6 @@ class _ObjectArray<E> implements List<E> {
     return IterableMixinWorkaround.mapList(this, f);
   }
 
-  List mappedBy(f(E element)) {
-    IterableMixinWorkaround.mappedByList(this, f);
-  }
-
   reduce(initialValue, combine(previousValue, E element)) {
     return IterableMixinWorkaround.reduce(this, initialValue, combine);
   }
@@ -164,7 +160,7 @@ class _ObjectArray<E> implements List<E> {
     return this.length == 0;
   }
 
-  List<E> get reversed => new ReversedListView<E>(this, 0, null);
+  Iterable<E> get reversed => new ReversedListIterable<E>(this);
 
   void sort([int compare(E a, E b)]) {
     IterableMixinWorkaround.sortList(this, compare);
@@ -338,10 +334,6 @@ class _ImmutableArray<E> implements List<E> {
     return IterableMixinWorkaround.mapList(this, f);
   }
 
-  List mappedBy(f(E element)) {
-    return IterableMixinWorkaround.mappedByList(this, f);
-  }
-
   String join([String separator]) {
     return IterableMixinWorkaround.joinList(this, separator);
   }
@@ -402,7 +394,7 @@ class _ImmutableArray<E> implements List<E> {
     return this.length == 0;
   }
 
-  List<E> get reversed => new ReversedListView<E>(this, 0, null);
+  Iterable<E> get reversed => new ReversedListIterable<E>(this);
 
   void sort([int compare(E a, E b)]) {
     throw new UnsupportedError(