Delete ash-based code for Windows drag-and-drop graphics.

ui/base/dragdrop/os_exchange_data.h

Index: ui/base/dragdrop/os_exchange_data.h
diff --git a/ui/base/dragdrop/os_exchange_data.h b/ui/base/dragdrop/os_exchange_data.h
index 683197de275155f86cc1006e2747d221abd83d19..282587d23df8113812d304194c41d196e61defaa 100644
--- a/ui/base/dragdrop/os_exchange_data.h
+++ b/ui/base/dragdrop/os_exchange_data.h
@@ -133,8 +133,8 @@ class UI_BASE_EXPORT OSExchangeData {
 #if defined(USE_AURA) || defined(OS_MACOSX)
     virtual void SetDragImage(const gfx::ImageSkia& image,
                               const gfx::Vector2d& cursor_offset) = 0;
-    virtual const gfx::ImageSkia& GetDragImage() const = 0;
-    virtual const gfx::Vector2d& GetDragImageOffset() const = 0;

[sadrul, 2017/04/19 17:04:50]

Was this a deliberate change? Can you document the reason in the CL description?

[danakj, 2017/04/19 17:20:22]

Yes, because the win one doesn't have anything to return, but this requires
non-local storage of an object to return. So it would have to make a static
variable or something weird for NOTREACHED() code.

+    virtual gfx::ImageSkia GetDragImage() const = 0;
+    virtual gfx::Vector2d GetDragImageOffset() const = 0;
 #endif
   };