Update standalone help message for removed legacy debugger protocol options.

runtime/bin/main.cc

 // Copyright (c) 2012, 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.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 864 matching lines @@
 "  Where to find packages, that is, \"package:...\" imports.\n"
 "--packages=<path>\n"
 "  Where to find a package spec file.\n"
 "--observe[=<port>[/<bind-address>]]\n"
 "  Enable the VM service and cause isolates to pause on exit (default port is\n"
 "  8181, default bind address is 127.0.0.1). With the default options,\n"
 "  Observatory will be available locally at http://127.0.0.1:8181/\n"
 "--version\n"
 "  Print the VM version.\n"
 "\n"
-"--debug[:<port number>]\n"
-"  enables debugging and listens on specified port for debugger connections\n"
-"  (default port number is 5858)\n"
-"\n"
-"--break-at=<location>\n"
-"  sets a breakpoint at specified location where <location> is one of :\n"
-"  url:<line_num> e.g. test.dart:10\n"
-"  [<class_name>.]<function_name> e.g. B.foo\n"
-"\n"
 "--snapshot=<file_name>\n"
 "  loads Dart script and generates a snapshot in the specified file\n"
 "\n"
 "--trace-loading\n"
 "  enables tracing of library and script loading\n"
 "\n"
 "--enable-vm-service[:<port number>]\n"
 "  enables the VM service and listens on specified port for connections\n"
 "  (default port number is 8181)\n"
 "\n"
@@ skipping 524 matching lines @@
   Platform::Exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }