Remove insertRange.

sdk/lib/collection/list.dart

Index: sdk/lib/collection/list.dart
diff --git a/sdk/lib/collection/list.dart b/sdk/lib/collection/list.dart
index 2852cde845060e43835bc5b1f5aaa4c3333f9fac..eb6a0be525a5b2e76d80b63da18636a0b942f579 100644
--- a/sdk/lib/collection/list.dart
+++ b/sdk/lib/collection/list.dart
@@ -324,21 +324,6 @@ abstract class ListMixin<E> implements List<E> {
     return new SubListIterable(this, start, end);
   }
 
-  void insertRange(int start, int length, [E initialValue]) {
-    if (start < 0 || start > this.length) {
-      throw new RangeError.range(start, 0, this.length);
-    }
-    int oldLength = this.length;
-    int moveLength = oldLength - start;
-    this.length += length;
-    if (moveLength > 0) {
-      this.setRange(start + length, oldLength, this, start);
-    }
-    for (int i = 0; i < length; i++) {
-      this[start + i] = initialValue;
-    }
-  }
-
   void removeRange(int start, int end) {
     if (start < 0 || start > this.length) {
       throw new RangeError.range(start, 0, this.length);