Enable Bluetooth Chrome APIs for M-36 beta.

BUG=376064

Review URL: https://codereview.chromium.org/287193008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272283 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/api/_manifest_features.json

@@ -46,7 +46,7 @@
     // Note: The "bluetooth" manifest permission is used by the
     // chrome.bluetooth, chrome.bluetoothSocket and chrome.bluetoothLowEnergy
     // APIs. Split this property if the APIs get released at different dates.
-    "channel": "dev",
+    "channel": "beta",
     "extension_types": ["platform_app"]
   },
   "browser_action": {