Remove insertRange.

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 6d955aef6a8d54477baac5d714820f3affbf2dbd..3deb4050772b2968608f25dcb7fff25032c93a0b 100644
--- a/sdk/lib/_collection_dev/list.dart
+++ b/sdk/lib/_collection_dev/list.dart
@@ -70,15 +70,10 @@ abstract class FixedLengthListMixin<E>  {
         "Cannot remove from a fixed-length list");
   }
 
-  void removeRange(int start, int length) {
+  void removeRange(int start, int end) {
     throw new UnsupportedError(
         "Cannot remove from a fixed-length list");
   }
-
-  void insertRange(int start, int length, [E initialValue]) {
-    throw new UnsupportedError(
-        "Cannot insert range in a fixed-length list");
-  }
 }
 
 /**
@@ -165,15 +160,10 @@ abstract class UnmodifiableListMixin<E> {
         "Cannot modify an unmodifiable list");
   }
 
-  void removeRange(int start, int length) {
+  void removeRange(int start, int end) {
     throw new UnsupportedError(
         "Cannot remove from an unmodifiable list");
   }
-
-  void insertRange(int start, int length, [E initialValue]) {
-    throw new UnsupportedError(
-        "Cannot insert range in an unmodifiable list");
-  }
 }
 
 /**