Move //device/generic_sensor to be part of the internal implementation of the Device Service.

services/device/public/interfaces/BUILD.gn

 # Copyright 2016 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
     "battery_monitor.mojom",
     "battery_status.mojom",
     "fingerprint.mojom",
     "power_monitor.mojom",
     "time_zone_monitor.mojom",
     "vibration_manager.mojom",
   ]
 
   public_deps = [
     ":constants",
   ]
 
   # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
   use_once_callback = false
 }
 
+mojom("generic_sensor") {
+  sources = [
+    "sensor.mojom",
+    "sensor_provider.mojom",
+  ]
+
+  public_deps = [
+    ":constants",
+  ]
+
+  # TODO(crbug.com/714018): Convert the implementation to use OnceCallback.
+  use_once_callback = false
+}
+
 mojom("constants") {
   sources = [
     "constants.mojom",
   ]
 }