Revert "Adding the following stylus metrics:"

ash/shell.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 102 matching lines @@
 class ScreenshotController;
 class ScreenPinningController;
 class ScreenPositionController;
 class SessionStateDelegate;
 class Shelf;
 class ShellDelegate;
 struct ShellInitParams;
 class SlowAnimationEventFilter;
 class StatusAreaWidget;
 class StickyKeysController;
-class StylusMetricsRecorder;
 class SystemGestureEventFilter;
 class SystemModalContainerEventFilter;
 class SystemTray;
 class ToplevelWindowEventHandler;
 class TouchTransformerController;
 class TouchObserverHUD;
 class UserWallpaperDelegate;
 class VirtualKeyboardController;
 class VideoActivityNotifier;
 class VideoDetector;
@@ skipping 436 matching lines @@
   // Listens for output changes and updates the display manager.
   std::unique_ptr<DisplayChangeObserver> display_change_observer_;
 
   // Implements content::ScreenOrientationController for ChromeOS
   std::unique_ptr<ScreenOrientationController> screen_orientation_controller_;
 
   std::unique_ptr<TouchTransformerController> touch_transformer_controller_;
 
   std::unique_ptr<ui::EventHandler> magnifier_key_scroll_handler_;
   std::unique_ptr<ui::EventHandler> speech_feedback_handler_;
-  std::unique_ptr<StylusMetricsRecorder> stylus_metrics_recorder_;
 #endif  // defined(OS_CHROMEOS)
 
   // |native_cursor_manager_| is owned by |cursor_manager_|, but we keep a
   // pointer to vend to test code.
   AshNativeCursorManager* native_cursor_manager_;
 
   // Cursor may be hidden on certain key events in ChromeOS, whereas we never
   // hide the cursor on Windows.
   std::unique_ptr<::wm::CursorManager> cursor_manager_;
 
@@ skipping 10 matching lines @@
   base::SequencedWorkerPool* blocking_pool_;
 
   bool in_mus_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_