Promote Web Notifications and the Push API to stable features.

Promote Web Notifications and the Push API to stable features.

Both APIs have received three LGTMs in their Intent to Ship threads, so
update the runtime feature statuses accordingly.

Web Notifications for Service Workers:
    https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Cr7_GRSd2zM

Push API:
    https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/UdGlL9PtBLo

Because we need to disable support for older Android versions and for
the Android WebView, this is part of a two-sided patch.

  [1] This patch.
  [2] https://codereview.chromium.org/914373003

BUG=432527, 350378, 90795
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190149

[Peter Beverloo, 2015-02-12 20:13:50]

peter@chromium.org changed reviewers:
+ mkwst@chromium.org, mvanouwerkerk@chromium.org

[Peter Beverloo, 2015-02-12 20:13:50]

o/

[Mike West, 2015-02-12 21:12:01]

LGTM. \o/

[Michael van Ouwerkerk, 2015-02-13 11:51:37]

lgtm

[Peter Beverloo, 2015-02-13 13:48:17]

New patchsets have been uploaded after l-g-t-m from
mkwst@chromium.org,mvanouwerkerk@chromium.org

[Peter Beverloo, 2015-02-13 13:49:52]

I'm going to put this on the commit queue right now, to make sure that the
second patch can be tested by try-bots and land before the end of today as well.

[Peter Beverloo, 2015-02-13 13:49:55]

The CQ bit was checked by peter@chromium.org

[commit-bot: I haz the power, 2015-02-13 13:51:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/919033003/40001

[commit-bot: I haz the power, 2015-02-13 15:16:02]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190149