Change getRange to sublist. Make getRange deprecated.

tests/standalone/io/web_socket_protocol_processor_test.dart

Index: tests/standalone/io/web_socket_protocol_processor_test.dart
diff --git a/tests/standalone/io/web_socket_protocol_processor_test.dart b/tests/standalone/io/web_socket_protocol_processor_test.dart
index 090d34575713d31d5a6c3bf5413222ced9e230a8..1490e711513cceb757891098bf4951bfe46aa397 100644
--- a/tests/standalone/io/web_socket_protocol_processor_test.dart
+++ b/tests/standalone/io/web_socket_protocol_processor_test.dart
@@ -120,7 +120,7 @@ void testFullMessages() {
       // Update the transformer one byte at the time.
       messageCount++;
       for (int i = 0; i < frame.length; i++) {
-        controller.add(frame.getRange(i, 1));
+        controller.add(<int>[frame[i]]);
       }
       Expect.equals(0, transformer._state);
       Expect.isNotNull(mc.data);
@@ -129,7 +129,7 @@ void testFullMessages() {
       // Update the transformer two bytes at the time.
       messageCount++;
       for (int i = 0; i < frame.length; i += 2) {
-        controller.add(frame.getRange(i, i + 1 < frame.length ? 2 : 1));
+        controller.add(frame.sublist(i, min(i + 2, frame.length)));
       }
       Expect.equals(0, transformer._state);
       Expect.isNotNull(mc.data);