Fix font sizes being incorrect when using --force-device-scale-factor.

ui/display/win/screen_win.cc

Index: ui/display/win/screen_win.cc
diff --git a/ui/display/win/screen_win.cc b/ui/display/win/screen_win.cc
index 0ba4da99f9c2f521ade885f1997ac608cd8fbdc3..636eb90dc3add9da339676e9612aba3990aeeaae 100644
--- a/ui/display/win/screen_win.cc
+++ b/ui/display/win/screen_win.cc
@@ -351,6 +351,11 @@ float ScreenWin::GetScaleFactorForHWND(HWND hwnd) {
   return screen_win_display.display().device_scale_factor();
 }
 
+// static
+float ScreenWin::GetSystemScaleFactor() {
+  return GetUnforcedDeviceScaleFactor();
+}
+
 HWND ScreenWin::GetHWNDFromNativeView(gfx::NativeView window) const {
   NOTREACHED();
   return nullptr;