old_contents: define(function () {
    return {
      chrome: {
        name: 'Chrome',
        versions: [4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50],
        current: 46
      },
      firefox: {
        name: 'Firefox',
        versions: ['3.6', 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48],
        current: 42
      },
      ie: {
        name: 'Internet Explorer',
        versions: [6, 7, 8, 9, 10, 11],
        current: 11
      },
      edge: {
        name: 'Microsoft Edge',
        versions: ['0.10', '0.11', 13, 15, 16, 19, 20, 23, 25],
        current: 25
      },
      safari: {
        name: 'Safari',
        versions: ['3.2', 4, 5, '5.1', 6, '6.1', 7, '7.1', 8, 9],
        current: '9'
      },
      opera: {
        name: 'Opera',
        versions: ['10.1', '10.5', '10.6', 11, '11.1', '11.5', '11.6', 12, '12.1', '12.16', 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35],
        current: 33
      },
      ios: {
        name: 'Safari on iOS',
        versions: ['3.0', '3.1', '3.2', '4.0', '4.1', '4.2', '4.3', '5.0', '5.1', '5.1', '6.0', '6.1', '7.0', '7.1', '8.0', '8.1', '9.1'],
        current: '9.1'
      },
      android: {
        name: 'Android WebKit',
        versions: ['2.2', '2.3', 3, 4, '4.1', '4.3', '4.4', '4.4.3', '4.4.4', '5.0', '5.1'],
        current: '5.1'
      }
    }
  });
  
new_contents: define(function () {
    return {
      chrome: {
        name: 'Chrome',
        versions: [4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56],
        current: 54
      },
      firefox: {
        name: 'Firefox',
        versions: ['3.6', 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61],
        current: 49
      },
      ie: {
        name: 'Internet Explorer',
        versions: [6, 7, 8, 9, 10, 11],
        current: 11
      },
      edge: {
        name: 'Microsoft Edge',
        versions: ['0.10', '0.11', 13, 15, 16, 19, 20, 23, 25, 27, 28, 31, 34, 37, 38],
        current: 38
      },
      safari: {
        name: 'Safari',
        versions: ['3.2', 4, 5, '5.1', 6, '6.1', 7, '7.1', 8, 9, 10],
        current: '10'
      },
      opera: {
        name: 'Opera',
        versions: ['10.1', '10.5', '10.6', 11, '11.1', '11.5', '11.6', 12, '12.1', '12.16', 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41],
        current: 41
      },
      ios: {
        name: 'Safari on iOS',
        versions: ['3.0', '3.1', '3.2', '4.0', '4.1', '4.2', '4.3', '5.0', '5.1', '5.1', '6.0', '6.1', '7.0', '7.1', '8.0', '8.1', '9.1', '10', '10.1'],
        current: '10.1'
      },
      android: {
        name: 'Android WebKit',
        versions: ['2.2', '2.3', 3, 4, '4.1', '4.3', '4.4', '4.4.3', '4.4.4', '5.0', '5.1', '6', '7', '7.1'],
        current: '7.1'
      }
    }
  });
  
subject: Update browser versions.