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

device/generic_sensor/public/cpp/BUILD.gn

Index: device/generic_sensor/public/cpp/BUILD.gn
diff --git a/device/generic_sensor/public/cpp/BUILD.gn b/device/generic_sensor/public/cpp/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..420fffb27a80ad7a789d280e358bd9ff99bd322d
--- /dev/null
+++ b/device/generic_sensor/public/cpp/BUILD.gn
@@ -0,0 +1,23 @@
+# 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.
+
+component("cpp") {
+  sources = [
+    "platform_sensor_configuration.cc",
+    "platform_sensor_configuration.h",
+    "sensor_reading.cc",
+    "sensor_reading.h",
+  ]
+
+  defines = [ "DEVICE_GENERIC_SENSOR_PUBLIC_IMPLEMENTATION" ]
+
+  public_deps = [
+    "//device/generic_sensor/public/interfaces",
+  ]
+
+  deps = [
+    "//base",
+    "//device/base/synchronization",
+  ]
+}