Update documentation on BluetoothAdapter method.

Update comment on RetrieveGattConnectedDevicesWithDiscoveryFilter()
to reflect it has since been implemented for Chrome OS.

Bug: 653032
Change-Id: I7ce40681a27ee60c7e8157e68eb2336c096d1517
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692504Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675778}

device/bluetooth/bluetooth_adapter.h

@@ -434,8 +434,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
   // being connected by Chromium, into |devices_|. This method is useful since
   // a discovery session cannot find devices that are already connected to the
   // computer.
-  // TODO(crbug.com/653032): Needs to be implemented for Android, ChromeOS and
-  // Windows.
+  // TODO(crbug.com/653032): Needs to be implemented for Android and Windows.
   virtual std::unordered_map<BluetoothDevice*, BluetoothDevice::UUIDSet>
   RetrieveGattConnectedDevicesWithDiscoveryFilter(
       const BluetoothDiscoveryFilter& discovery_filter);