diff --git a/widget/windows/InputDeviceUtils.cpp b/widget/windows/InputDeviceUtils.cpp
index 7e9a2b07ca09..6969f62f1bdf 100644
--- a/widget/windows/InputDeviceUtils.cpp
+++ b/widget/windows/InputDeviceUtils.cpp
@@ -10,7 +10,6 @@
 #include <dbt.h>
 #include <hidclass.h>
 #include <ntddmou.h>
-#include <setupapi.h>
 
 namespace mozilla {
 namespace widget {
@@ -38,32 +37,5 @@ InputDeviceUtils::UnregisterNotification(HDEVNOTIFY aHandle)
   UnregisterDeviceNotification(aHandle);
 }
 
-DWORD
-InputDeviceUtils::CountMouseDevices()
-{
-  HDEVINFO hdev = SetupDiGetClassDevs(&GUID_DEVINTERFACE_MOUSE,
-                                      nullptr,
-                                      nullptr,
-                                      DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
-  if (hdev == INVALID_HANDLE_VALUE) {
-    return 0;
-  }
-
-  DWORD count = 0;
-  SP_INTERFACE_DEVICE_DATA info = {};
-  info.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
-  while (SetupDiEnumDeviceInterfaces(hdev,
-                                     nullptr,
-                                     &GUID_DEVINTERFACE_MOUSE,
-                                     index,
-                                     &info)) {
-    if (info.Flags & SPINT_ACTIVE) {
-      count++;
-    }
-  }
-  SetupDiDestroyDeviceInfoList(hdev);
-  return count;
-}
-
 } // namespace widget
 } // namespace mozilla
diff --git a/widget/windows/InputDeviceUtils.h b/widget/windows/InputDeviceUtils.h
index 75efc7d95c77..0b586f32b814 100644
--- a/widget/windows/InputDeviceUtils.h
+++ b/widget/windows/InputDeviceUtils.h
@@ -16,9 +16,6 @@ class InputDeviceUtils {
 public:
   static HDEVNOTIFY RegisterNotification(HWND aHwnd);
   static void UnregisterNotification(HDEVNOTIFY aHandle);
-
-  // Returns the number of mouse type devices connected to this system.
-  static DWORD CountMouseDevices();
 };
 
 } // namespace widget
diff --git a/widget/windows/WinUtils.cpp b/widget/windows/WinUtils.cpp
index 204dcc80b993..03656197da6c 100644
--- a/widget/windows/WinUtils.cpp
+++ b/widget/windows/WinUtils.cpp
@@ -13,7 +13,6 @@
 #include "gfxUtils.h"
 #include "nsWindow.h"
 #include "nsWindowDefs.h"
-#include "InputDeviceUtils.h"
 #include "KeyboardLayout.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/BackgroundHangMonitor.h"
@@ -1901,26 +1900,7 @@ IsTabletDevice()
 static bool
 IsMousePresent()
 {
-  if (!::GetSystemMetrics(SM_MOUSEPRESENT)) {
-    return false;
-  }
-
-  DWORD count = InputDeviceUtils::CountMouseDevices();
-  if (!count) {
-    return false;
-  }
-
-  // If there is a mouse device and if this machine is a tablet or has a
-  // digitizer, that's counted as the mouse device.
-  // FIXME: Bug 1495938:  We should drop this heuristic way once we find out a
-  // reliable way to tell there is no mouse or not.
-  if (count == 1 &&
-      (WinUtils::IsTouchDeviceSupportPresent() ||
-       IsTabletDevice())) {
-    return false;
-  }
-
-  return true;
+  return ::GetSystemMetrics(SM_MOUSEPRESENT);
 }
 
 /* static */
@@ -1932,7 +1912,7 @@ WinUtils::GetPrimaryPointerCapabilities()
   }
 
   if (IsMousePresent()) {
-    return PointerCapabilities::Fine |
+    return PointerCapabilities::Fine|
            PointerCapabilities::Hover;
   }