[DeviceService] Move screen_orientation.mojom from //content to //device.

device/screen_orientation/public/interfaces/screen_orientation.mojom

Index: device/screen_orientation/public/interfaces/screen_orientation.mojom
diff --git a/device/screen_orientation/public/interfaces/screen_orientation.mojom b/device/screen_orientation/public/interfaces/screen_orientation.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..0cc849e642426c39224521d45b6d033f7077d7a2
--- /dev/null
+++ b/device/screen_orientation/public/interfaces/screen_orientation.mojom
@@ -0,0 +1,13 @@
+// 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.
+
+module device.mojom;
+
+import "device/screen_orientation/public/interfaces/screen_orientation_lock_types.mojom";
+
+interface ScreenOrientation {
+  LockOrientation(ScreenOrientationLockType orientation) =>
+    (ScreenOrientationLockResult result);
+  UnlockOrientation();
+};