Make the VM's dart:core and dart:async library patches clean.

runtime/lib/immutable_map.dart

Index: runtime/lib/immutable_map.dart
diff --git a/runtime/lib/immutable_map.dart b/runtime/lib/immutable_map.dart
index ba866e39cf3769864345229f65abca18e3b5ae32..87c1689c15436ac6d70d5b078039da84adbbcc14 100644
--- a/runtime/lib/immutable_map.dart
+++ b/runtime/lib/immutable_map.dart
@@ -3,10 +3,10 @@
 // BSD-style license that can be found in the LICENSE file.
 // Immutable map class for compiler generated map literals.
 
-class ImmutableMap<K, V> implements Map<K, V> {
+class _ImmutableMap<K, V> implements Map<K, V> {
   final _ImmutableList _kvPairs;
 
-  const ImmutableMap._create(_ImmutableList keyValuePairs)
+  const _ImmutableMap._create(_ImmutableList keyValuePairs)
       : _kvPairs = keyValuePairs;
 
 
@@ -86,7 +86,7 @@ class ImmutableMap<K, V> implements Map<K, V> {
 }
 
 class _ImmutableMapKeyIterable<E> extends EfficientLengthIterable<E> {
-  final ImmutableMap _map;
+  final _ImmutableMap _map;
   _ImmutableMapKeyIterable(this._map);
 
   Iterator<E> get iterator {
@@ -97,7 +97,7 @@ class _ImmutableMapKeyIterable<E> extends EfficientLengthIterable<E> {
 }
 
 class _ImmutableMapValueIterable<E> extends EfficientLengthIterable<E> {
-  final ImmutableMap _map;
+  final _ImmutableMap _map;
   _ImmutableMapValueIterable(this._map);
 
   Iterator<E> get iterator {
@@ -108,7 +108,7 @@ class _ImmutableMapValueIterable<E> extends EfficientLengthIterable<E> {
 }
 
 class _ImmutableMapKeyIterator<E> implements Iterator<E> {
-  ImmutableMap _map;
+  _ImmutableMap _map;
   int _index = -1;
   E _current;
 
@@ -130,7 +130,7 @@ class _ImmutableMapKeyIterator<E> implements Iterator<E> {
 }
 
 class _ImmutableMapValueIterator<E> implements Iterator<E> {
-  ImmutableMap _map;
+  _ImmutableMap _map;
   int _index = -1;
   E _current;