Fix warnings detected by the analyzer.

sdk/lib/collection_dev/list.dart

Index: sdk/lib/collection_dev/list.dart
diff --git a/sdk/lib/collection_dev/list.dart b/sdk/lib/collection_dev/list.dart
index 0f2604b44bce29b156f2ef8b384db157b23666bc..ba9407ed71130256a7cda87d27610e629d6cc527 100644
--- a/sdk/lib/collection_dev/list.dart
+++ b/sdk/lib/collection_dev/list.dart
@@ -106,6 +106,10 @@ abstract class ListBase<E> extends Collection<E> implements List<E> {
   }
 
   String toString() => ToString.collectionToString(this);
+
+  List<E> get reversed {
+    return new ReversedListView(this, 0, null);
+  }
 }
 
 /**
@@ -114,8 +118,6 @@ abstract class ListBase<E> extends Collection<E> implements List<E> {
 abstract class FixedLengthListBase<E> extends ListBase<E> {
   void operator[]=(int index, E value);
 
-  List<E> get reversed => new ReversedListView<E>(this, 0, null);
-
   void sort([Comparator<E> compare]) {
     Sort.sort(this, compare);
   }
@@ -531,7 +533,7 @@ class ReverseListIterator<E> implements Iterator<E> {
 
   bool moveNext() {
     if (_list.length != _originalLength) {
-      throw new ConcurrentModificationError(list);
+      throw new ConcurrentModificationError(_list);
     }
     if (_index <= _start) return false;
     _index -= 1;