{
  "firefox": "28",
  "chrome": "30",
  "safari": "7.1"
}

{
  "firefox": "28",
  "chrome": "22",
  "safari": "7.1"
}

Support Chrome as old as 22
Support Chrome as old as 22

Now that we shim DOMParser, we can support all versions of Chrome that
have a working implementation of standard flexbox. According to caniuse,
this should allow us to go back to 21, but testing on 21 indicates that
its flex implementation is buggy. Works fine on 22 though.
