anchor.diff:  import 'dart:async';
   import 'dart:io';
   
  +import 'package:path/path.dart' as p;
   import 'package:webkit_inspection_protocol/webkit_inspection_protocol.dart';
   
   // TODO(kenzie): move this code to dart-lang/browser_launcher. This code was
  
positive.code:   }
    if (Platform.isLinux) return _linuxExecutable;
    if (Platform.isMacOS) return _macOSExecutable;
    if (Platform.isWindows) return _windowsExecutable;
    throw StateError('Unexpected platform type.');
  }
  
  
negative.code: const _macOSExecutable =
      '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';
  const _windowsExecutable = r'Google\Chrome\Application\chrome.exe';
  var _windowsPrefixes = [
    Platform.environment['LOCALAPPDATA'],
    Platform.environment['PROGRAMFILES'],
    Platform.environment['PROGRAMFILES(X86)']
  ];
  
  String get _executable {
    if (Platform.environment.containsKey(_chromeEnvironment)) {
  