Remove dependency on ui::ScaleFactor from ui/gfx

ui/gfx/canvas_paint_mac.mm

Index: ui/gfx/canvas_paint_mac.mm
diff --git a/ui/gfx/canvas_paint_mac.mm b/ui/gfx/canvas_paint_mac.mm
index c8796afedae60b1dd56a6cb9f59de79ea883c4e2..8ba697d1091ec3dd6d99fd03fe5d2e7832719c61 100644
--- a/ui/gfx/canvas_paint_mac.mm
+++ b/ui/gfx/canvas_paint_mac.mm
@@ -58,9 +58,8 @@ void CanvasSkiaPaint::Init(bool opaque) {
     // Assume that the x scale and the y scale are the same.
   CGFloat scale = scaled_unit_rect.size.width;
 
-  ui::ScaleFactor scale_factor = ui::GetScaleFactorFromScale(scale);
   gfx::Size size(NSWidth(rectangle_), NSHeight(rectangle_));
-  RecreateBackingCanvas(size, scale_factor, opaque);
+  RecreateBackingCanvas(size, scale, opaque);
   skia::PlatformCanvas* canvas = platform_canvas();
   canvas->clear(SkColorSetARGB(0, 0, 0, 0));
 
@@ -74,4 +73,4 @@ void CanvasSkiaPaint::Init(bool opaque) {
 
 }  // namespace skia
 
- 
+