Revert of Rename MaximizeMode to TabletMode

ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc

Index: ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
diff --git a/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc b/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
deleted file mode 100644
index f26876351c64c0e1a029e6a7a1c44910098bde8b..0000000000000000000000000000000000000000
--- a/ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.cc
+++ /dev/null
@@ -1,17 +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.
-
-#include "ash/wm/tablet_mode/tablet_mode_backdrop_delegate_impl.h"
-
-namespace ash {
-
-TabletModeBackdropDelegateImpl::TabletModeBackdropDelegateImpl() = default;
-
-TabletModeBackdropDelegateImpl::~TabletModeBackdropDelegateImpl() = default;
-
-bool TabletModeBackdropDelegateImpl::HasBackdrop(aura::Window* window) {
-  return true;
-}
-
-}  // namespace ash