Moved url_handlers from dev to stable

BUG=333092

Review URL: https://codereview.chromium.org/132533003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244249 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/api/_manifest_features.json

@@ -385,7 +385,7 @@
     "extension_types": "all"
   },
   "url_handlers": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "version": {