anchor.diff:  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)) {
  
positive.code:   }
    if (Platform.isLinux) return _linuxExecutable;
    if (Platform.isMacOS) return _macOSExecutable;
    if (Platform.isWindows) return _windowsExecutable;
    throw StateError('Unexpected platform type.');
  }
  
  
negative.code: 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
  