(Re)move methods from internal.Lists that are not used, or only used once.

runtime/lib/array.dart

Index: runtime/lib/array.dart
diff --git a/runtime/lib/array.dart b/runtime/lib/array.dart
index cf124ba6259c9e72c2f16e9a12b978e7bd910dd3..aab9f31a6c69b8d8f31b4768245e6ff22c25ee3f 100644
--- a/runtime/lib/array.dart
+++ b/runtime/lib/array.dart
@@ -60,10 +60,9 @@ class _List<E> extends FixedLengthListBase<E> {
   }
 
   List<E> sublist(int start, [int end]) {
-    Lists.indicesCheck(this, start, end);
-    if (end == null) end = this.length;
+    end = RangeError.checkValidRange(start, end, this.length);
     int length = end - start;
-    if (start == end) return <E>[];
+    if (length == 0) return <E>[];
     var result = new _GrowableList<E>.withData(_slice(start, length, false));
     result._setLength(length);
     return result;
@@ -136,8 +135,7 @@ class _ImmutableList<E> extends UnmodifiableListBase<E> {
   int get length native "List_getLength";
 
   List<E> sublist(int start, [int end]) {
-    Lists.indicesCheck(this, start, end);
-    if (end == null) end = this.length;
+    end = RangeError.checkValidRange(start, end, this.length);
     int length = end - start;
     if (length == 0) return <E>[];
     List list = new _List(length);