Push the chrome.bluetooth ChromeOS Platform App API to stable for M33.

BUG=242982
R=asargent@chromium.org

Review URL: https://codereview.chromium.org/74533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235851 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/api/_permission_features.json

@@ -98,11 +98,11 @@
     }
   ],
   "bluetooth": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "bluetoothDevices": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "bookmarkManagerPrivate": {