GitLab

* Rename "max state" value to "num states" so it sounds less like it's the
  largest valid state
* Shorten/simplify code
* Reduce indenting
* No else after return
* Use scoping objects where possible
* Return directly out of switches where possible
* Don't handle DCHECK failure
* Omit NOTREACHED messages (not necessary in tracking down bugs)
* "const" goes on same line as last function arg
* Order "disabled/hovered/normal/pressed" cases the same way every time
* Fix spelling errors
* Eliminate unnecessary {}s

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/377423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282533 0039d316-1c4b-4281-b951-d872f2087c98