anchor.diff:                     String stableVersion) {
     final urlBase = 'https://storage.googleapis.com/dart-archive/channels';
     final dartiumFile = 'dartium/dartium-macos-ia32-release.zip';
  +  final contentShellFile = 'dartium/content_shell-macos-ia32-release.zip';
   
     return '''
   require 'formula'
  
positive.code:     version '$devVersion'
      url '$urlBase/dev/release/${revisions['dev']}/$dartiumFile'
      sha256 '${hashes['dev'][dartiumFile]}'
    end
  
    def shim_script target
      <<-EOS.undent
        #!/bin/bash
        open "#{prefix}/#{target}" "\$@"
      EOS
    end
  
    def install
      prefix.install Dir['*']
      (bin+"dartium").write shim_script "Chromium.app"
    end
  
    def caveats; <<-EOS.undent
  
negative.code: 
  final SDK_FILES = ['sdk/dartsdk-macos-x64-release.zip',
                     'sdk/dartsdk-macos-ia32-release.zip' ];
  final DARTIUM_FILES = ['dartium/dartium-macos-ia32-release.zip',
                         'dartium/content_shell-macos-ia32-release.zip'];
  final FILES = []..addAll(SDK_FILES)..addAll(DARTIUM_FILES);
  
  
  