Move device opening from DeviceManager to Device.

device/devices_app/usb/public/interfaces/device_manager.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module device.usb;
 
 import "device.mojom";
 
-enum OpenDeviceError {
-  // Opening the device succeeded.
-  OK,
-
-  // The device could not be opened because the request GUID is unknown.
-  NOT_FOUND,
-
-  // The operating system denied access to the device.
-  ACCESS_DENIED,
-};
-
 struct DeviceFilter {
   bool has_vendor_id;
   uint16 vendor_id;
 
   bool has_product_id;
   uint16 product_id;
 
   bool has_class_code;
   uint8 class_code;
 
@@ skipping 16 matching lines @@
 interface DeviceManager {
   // Retrieves information about all devices available to the DeviceManager
   // implementation.
   GetDevices(EnumerationOptions? options) => (array<DeviceInfo> results);
 
   // Retrieves information about changes to the set of devices available to the
   // DeviceManager since the last call to this method. A device that is added
   // and removed between calls will not be included.
   GetDeviceChanges() => (DeviceChangeNotification changes);
 
-  // Attempts to open a device given its GUID.
-  OpenDevice(string guid, Device& device_request) => (OpenDeviceError error);
+  // Requests a device by guid.
+  GetDevice(string guid, Device& device_request);
 };