Reland 4e4eae4cbe6136b538a: Make download item drags look like bookmark

ui/views/drag_utils.h

Index: ui/views/drag_utils.h
diff --git a/ui/views/drag_utils.h b/ui/views/drag_utils.h
index db95cddeefe8746a048e30864dd0046bbb8e69b2..5f2c5b52316806c5b235a9dd16b2074746e1b232 100644
--- a/ui/views/drag_utils.h
+++ b/ui/views/drag_utils.h
@@ -31,11 +31,11 @@ VIEWS_EXPORT void RunShellDrag(gfx::NativeView view,
 
 // Returns the device scale for the display associated with this |widget|'s
 // native view.
-VIEWS_EXPORT float ScaleFactorForDragFromWidget(Widget* widget);
+VIEWS_EXPORT float ScaleFactorForDragFromWidget(const Widget* widget);
 
 // Returns a canvas that can be used to draw the drag image. Caller owns the
 // returned object. |widget| is Widget hosting the view being dragged.
-VIEWS_EXPORT gfx::Canvas* GetCanvasForDragImage(Widget* widget,
+VIEWS_EXPORT gfx::Canvas* GetCanvasForDragImage(const Widget* widget,
                                                 const gfx::Size& canvas_size);
 
 }  // namespace views