Put storage API back into stable channel

R=aa@chromium.org
BUG=124477

Review URL: http://codereview.chromium.org/10177006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134654 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/api/_permission_features.json

@@ -181,7 +181,7 @@
     "extension_types": ["platform_app"]
   },
   "storage": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["extension", "packaged_app", "platform_app"],
     "min_manifest_version": 2
   },