- Remove the legacy debug protocol.

tests/standalone/debugger/step_inout_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import "debug_lib.dart";
-
-main(List<String> arguments) {
-  if (RunScript(testScript, arguments)) return;
-
-  foo('foo1');
-  foo('foo2');
-  foo('foo3');
-}
-
-void foo(String str) {
-  print(str);
-}
-
-/**
- * Set a breakpoint, resume to that breakpoint, step into a method, step out,
- * step over the next line, and resume execution.
- */
-var testScript = [
-  MatchFrames(["main"]),
-  SetBreakpoint(10),
-  Resume(),
-  MatchFrames(["main"]),
-  StepInto(),
-  MatchFrames(["foo", "main"]),
-  StepOut(),
-  MatchFrames(["main"]),
-  Step(),
-  MatchFrames(["main"]),
-  Resume(),
-];