Revert "Move Arrays class to private library."

sdk/lib/collection/collections.dart

Index: sdk/lib/collection/collections.dart
diff --git a/sdk/lib/collection/collections.dart b/sdk/lib/collection/collections.dart
index 09a0778250d70de8b6329a1bf192e88fd5e52743..949b69dfa0128442d93ee878aba2df1158da614b 100644
--- a/sdk/lib/collection/collections.dart
+++ b/sdk/lib/collection/collections.dart
@@ -347,42 +347,13 @@ class IterableMixinWorkaround {
     return new SkipWhileIterable(iterable, test);
   }
 
-  static Iterable reversedList(List list) {
-    return new ReversedListIterable(list);
+  static Iterable reversedList(List l) {
+    return new ReversedListIterable(l);
   }
 
-  static void sortList(List list, int compare(a, b)) {
+  static void sortList(List l, int compare(a, b)) {
     if (compare == null) compare = Comparable.compare;
-    Sort.sort(list, compare);
-  }
-
-  static int indexOfList(List list, var element, int start) {
-    return Arrays.indexOf(list, element, start, list.length);
-  }
-
-  static int lastIndexOfList(List list, var element, int start) {
-    if (start == null) start = list.length - 1;
-    return Arrays.lastIndexOf(list, element, start);
-  }
-
-  static void setRangeList(List list, int start, int length,
-                           List from, int startFrom) {
-    if (length == 0) return;
-
-    // TODO(floitsch): decide what to do with these checks. Currently copied
-    // since that was the old behavior of dart2js, and some co19 tests rely on
-    // it.
-    if (start is! int) throw new ArgumentError(start);
-    if (length is! int) throw new ArgumentError(length);
-    if (from is! List) throw new ArgumentError(from);
-    if (startFrom is! int) throw new ArgumentError(startFrom);
-    if (length < 0) throw new ArgumentError(length);
-    if (start < 0) throw new RangeError.value(start);
-    if (start + length > list.length) {
-      throw new RangeError.value(start + length);
-    }
-
-    Arrays.copy(from, startFrom, list, start, length);
+    Sort.sort(l, compare);
   }
 
   static Map<int, dynamic> asMapList(List l) {