Move Windows DPI Code from ui/gfx to ui/display

ui/views/controls/menu/menu_separator_win.cc

Index: ui/views/controls/menu/menu_separator_win.cc
diff --git a/ui/views/controls/menu/menu_separator_win.cc b/ui/views/controls/menu/menu_separator_win.cc
index 182cc2b3294aa403bc06057e2673943270a433ad..2ecabdbeb1c30056d49da57d03ea94d0db9ff6e0 100644
--- a/ui/views/controls/menu/menu_separator_win.cc
+++ b/ui/views/controls/menu/menu_separator_win.cc
@@ -8,9 +8,9 @@
 #include <uxtheme.h>
 #include <Vssym32.h>
 
+#include "ui/display/win/dpi.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/win/dpi.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/native_theme/native_theme_aura.h"
 #include "ui/views/controls/menu/menu_item_view.h"
@@ -29,7 +29,7 @@ void MenuSeparator::OnPaint(gfx::Canvas* canvas) {
   // Hack to get the separator to display correctly on Windows where we may
   // have fractional scales. We move the separator 1 pixel down to ensure that
   // it falls within the clipping rect which is scaled up.
-  float device_scale = gfx::GetDPIScale();
+  float device_scale = display::win::GetDPIScale();
   bool is_fractional_scale =
       (device_scale - static_cast<int>(device_scale) != 0);
   if (is_fractional_scale && separator_bounds.y() == 0)