anchor.diff:  
       if (!debuggingOptions.debuggingEnabled) {
         // If debugging is not enabled, just launch the application and continue.
  -      printTrace("Debugging is not enabled");
  +      printTrace('Debugging is not enabled');
         installationResult = await runCommandAndStreamOutput(launchCommand, trace: true);
       } else {
         // Debugging is enabled, look for the observatory and diagnostic server
         // ports post launch.
  -      printTrace("Debugging is enabled, connecting to observatory and the diagnostic server");
  +      printTrace('Debugging is enabled, connecting to observatory and the diagnostic server');
   
         // TODO(danrubel): The Android device class does something similar to this code below.
         // The various Device subclasses should be refactored and common code moved into the superclass.
  
positive.code:     _loggerPath = _checkForCommand('idevicesyslog');
      _screenshotPath = _checkForCommand('idevicescreenshot');
      _pusherPath = _checkForCommand(
          'ios-deploy',
          'To copy files to iOS devices, please install ios-deploy. To install, run:\n'
          'brew update\n'
          'brew install ios-deploy');
    }
  
    String _installerPath;
  
negative.code:     }
  
      // Step 3: Attempt to install the application on the device.
      final List<String> launchArguments = <String>['--enable-dart-profiling'];
  
      if (debuggingOptions.startPaused)
        launchArguments.add('--start-paused');
  
      if (debuggingOptions.useTestFonts)
        launchArguments.add('--use-test-fonts');
  
      if (debuggingOptions.debuggingEnabled) {
        launchArguments.add('--enable-checked-mode');
  
        // Note: We do NOT need to set the observatory port since this is going to
        // be setup on the device. Let it pick a port automatically. We will check
  