Restrict chrome.app.window alwaysOnTop property to dev channel
The alwaysOnTop property is restricted to dev channel for M32.
This patch also fixes a problem in the permissions for app window
functions such as setAlwaysOnTop, setMinWidth, etc. The restriction
to dev channel should be done in code instead of _api_features.json.
BUG=319521, 319658
TESTS=browser_tests (PlatformAppBrowserTest.WindowsApiAlwaysOnTop*)
R=benwells@chromium.org
Review URL: https://codereview.chromium.org/
73653002
Patch from Thanh-Mai Diep <tmdiep@chromium.org>.
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235311 0039d316-1c4b-4281-b951-d872f2087c98