Mojo-ify implementation of screen orientation locking/unlocking.

content/common/screen_orientation.mojom

Index: content/common/screen_orientation.mojom
diff --git a/content/common/screen_orientation.mojom b/content/common/screen_orientation.mojom
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+// 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 content.mojom;
+
+import "third_party/WebKit/public/platform/modules/screen_orientation/screen_orientation_lock_types.mojom";
+
+interface ScreenOrientation {
+  LockOrientation(blink.mojom.ScreenOrientationLockType orientation) =>
+    (blink.mojom.ScreenOrientationLockResult result);
+  UnlockOrientation();
+};