Adding metrics logging for Simplified Gesture Navigation.

content/browser/web_contents/aura/uma_navigation_type.h

Index: content/browser/web_contents/aura/uma_navigation_type.h
diff --git a/content/browser/web_contents/aura/uma_navigation_type.h b/content/browser/web_contents/aura/uma_navigation_type.h
deleted file mode 100644
index 53294b9d9196368d311d334630d2ac2a872c6b81..0000000000000000000000000000000000000000
--- a/content/browser/web_contents/aura/uma_navigation_type.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2017 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.
-
-namespace content {
-
-// Note that this enum is used to back an UMA histogram, so it should be
-// treated as append-only.
-enum UmaNavigationType {
-  NAVIGATION_TYPE_NONE,
-  FORWARD_TOUCHPAD,
-  BACK_TOUCHPAD,
-  FORWARD_TOUCHSCREEN,
-  BACK_TOUCHSCREEN,
-  NAVIGATION_TYPE_COUNT,
-};
-
-}  // namespace content