Remove enable/disable wheel gestures setting.

content/browser/renderer_host/render_widget_host_view_mac.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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurface.h>
 #include <stddef.h>
@@ skipping 311 matching lines @@
 
   bool HasAcceleratedSurface(const gfx::Size& desired_size) override;
   void GetScreenInfo(blink::WebScreenInfo* results) override;
   bool GetScreenColorProfile(std::vector<char>* color_profile) override;
   gfx::Rect GetBoundsInRootWindow() override;
   void LockCompositingSurface() override;
   void UnlockCompositingSurface() override;
 
   bool LockMouse() override;
   void UnlockMouse() override;
-  void WheelEventAck(const blink::WebMouseWheelEvent& event,
-                     InputEventAckState ack_result) override;
   void GestureEventAck(const blink::WebGestureEvent& event,
                        InputEventAckState ack_result) override;
 
   std::unique_ptr<SyntheticGestureTarget> CreateSyntheticGestureTarget()
       override;
 
   uint32_t GetSurfaceIdNamespace() override;
   uint32_t SurfaceIdNamespaceAtPoint(cc::SurfaceHittestDelegate* delegate,
                                      const gfx::Point& point,
                                      gfx::Point* transformed_point) override;
@@ skipping 231 matching lines @@
   // The last scroll offset of the view.
   gfx::Vector2dF last_scroll_offset_;
 
   // The text to be shown in the tooltip, supplied by the renderer.
   base::string16 tooltip_text_;
 
   // True when this view acts as a platform view hack for a
   // RenderWidgetHostViewGuest.
   bool is_guest_view_hack_;
 
-  // True if gestures are generated for mouse wheel events.
-  bool wheel_gestures_enabled_;
-
   // selected text on the renderer.
   std::string selected_text_;
 
   // The window used for popup widgets.
   base::scoped_nsobject<NSWindow> popup_window_;
 
   // The fullscreen window used for pepper flash.
   base::scoped_nsobject<NSWindow> pepper_fullscreen_window_;
   base::scoped_nsobject<FullscreenWindowManager> fullscreen_window_manager_;
   // Our parent host view, if this is fullscreen.  NULL otherwise.
@@ skipping 24 matching lines @@
 
   // Factory used to safely scope delayed calls to ShutdownHost().
   base::WeakPtrFactory<RenderWidgetHostViewMac> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_