Deprecate the unofficial -webkit-transition media feature because of two reasons:

1) It's prefixed and transitions are now unprefixed.
2) Authors can accomplish the same using CSS conditionals.

Measure usage and add a deprecation warning to the console.

Review URL: https://chromiumcodereview.appspot.com/15001026

git-svn-id: svn://svn.chromium.org/blink/trunk@150503 bbb929c8-8fbe-4397-9dbb-9b2b20218538
5 files changed