anchor.diff:     * A code indicating that a specified feature is not supported on Chrome OS.
      */
     static const ManifestWarningCode UNSUPPORTED_CHROME_OS_FEATURE =
  -      const ManifestWarningCode(
  -          'UNSUPPORTED_CHROME_OS_FEATURE',
  -          "This feature is not supported on Chrome OS. Try changing " +
  -              "`android:required to \"false\"` for this feature.",
  +      const ManifestWarningCode('UNSUPPORTED_CHROME_OS_FEATURE',
  +          "This feature is not supported on Chrome OS, consider making it optional.",
             correction: "Try changing to `android:required=\"false\"` for this " +
                 "feature.");
   
  
positive.code:    * A code indicating that a specified permission is not supported on Chrome OS.
     */
    static const ManifestWarningCode PERMISSION_IMPLIES_UNSUPPORTED_HARDWARE =
        const ManifestWarningCode(
            'PERMISSION_IMPLIES_UNSUPPORTED_HARDWARE',
            "Permission exists without corresponding hardware tag `<uses-feature " +
                "android:name=\"{0}\"  android:required=\"false\">`.",
            correction:
                "Try adding the uses-feature with required=\"false\" attribute value.");
  
    /**
     * A code indicating that the camera permissions is not supported on Chrome OS.
     */
    static const ManifestWarningCode CAMERA_PERMISSIONS_INCOMPATIBLE =
        const ManifestWarningCode(
            'CAMERA_PERMISSIONS_INCOMPATIBLE',
            "Permission exists without corresponding hardware `<uses-feature " +
                "android:name=\"android.hardware.camera\"  android:required=\"false\">` " +
                "`<uses-feature " +
                "android:name=\"android.hardware.camera.autofocus\"  android:required=\"false\">`.",
            correction:
                "Try adding the uses-feature with required=\"false\" attribute value.");
  
    /**
     * A code indicating that the activity is set to be non resizable.
  
negative.code:    * A code indicating that a specified hardware feature is not supported on Chrome OS.
     */
    static const ManifestWarningCode UNSUPPORTED_CHROME_OS_HARDWARE =
        const ManifestWarningCode('UNSUPPORTED_CHROME_OS_HARDWARE',
            "This feature is not supported on Chrome OS, consider making it optional.",
            correction:
                "Try adding `android:required=\"false\"` for this " + "feature.");
  
  