Revert 272317 "Enable Bluetooth Chrome APIs for M-36 beta."

> Enable Bluetooth Chrome APIs for M-36 beta.
> 
> BUG=376064
> 
> 

TBR=tengs@chromium.org

Review URL: https://codereview.chromium.org/296983009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272331 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": "beta",
+    "channel": "dev",
     "extension_types": ["platform_app"]
   },
   "browser_action": {