Revert of Remove enable/disable wheel gestures setting.

content/browser/renderer_host/input/mouse_wheel_event_queue.h

Index: content/browser/renderer_host/input/mouse_wheel_event_queue.h
diff --git a/content/browser/renderer_host/input/mouse_wheel_event_queue.h b/content/browser/renderer_host/input/mouse_wheel_event_queue.h
index a2722310b74b68c0c7e5c3f261851c65a969432d..1b7a5f36f2d887db3885f490acdb5c7d7bb5ca3a 100644
--- a/content/browser/renderer_host/input/mouse_wheel_event_queue.h
+++ b/content/browser/renderer_host/input/mouse_wheel_event_queue.h
@@ -47,6 +47,7 @@
   // |scroll_transaction_ms| is the duration in which the
   // ScrollEnd should be sent after a ScrollUpdate.
   MouseWheelEventQueue(MouseWheelEventQueueClient* client,
+                       bool send_gestures,
                        int64_t scroll_transaction_ms);
 
   ~MouseWheelEventQueue();
@@ -97,6 +98,7 @@
   // GSB has been sent in the past.
   bool needs_scroll_end_;
 
+  bool send_gestures_;
   int64_t scroll_transaction_ms_;
   blink::WebGestureDevice scrolling_device_;