Revert of Don't handle NaturalScroll in Chrome but pass it to CMT instead

ui/events/x/device_data_manager.h

Index: ui/events/x/device_data_manager.h
diff --git a/ui/events/x/device_data_manager.h b/ui/events/x/device_data_manager.h
index ce009a0086f94bb7215e233022b73a350165c29d..aff064935718000d97f23a866178e0629fe4e810 100644
--- a/ui/events/x/device_data_manager.h
+++ b/ui/events/x/device_data_manager.h
@@ -104,8 +104,17 @@
   // Returns the DeviceDataManager singleton.
   static DeviceDataManager* GetInstance();
 
+  // Natural scroll setter/getter.
+  bool natural_scroll_enabled() const { return natural_scroll_enabled_; }
+  void set_natural_scroll_enabled(bool enabled) {
+    natural_scroll_enabled_ = enabled;
+  }
+
   // Returns if XInput2 is available on the system.
   bool IsXInput2Available() const;
+
+  // Get the natural scroll direction multiplier (1.0f or -1.0f).
+  float GetNaturalScrollFactor(int sourceid) const;
 
   // Updates the list of devices.
   void UpdateDeviceList(Display* display);
@@ -239,6 +248,7 @@
   static const int kMaxDeviceNum = 128;
   static const int kMaxXIEventType = XI_LASTEVENT + 1;
   static const int kMaxSlotNum = 10;
+  bool natural_scroll_enabled_;
 
   // Major opcode for the XInput extension. Used to identify XInput events.
   int xi_opcode_;