Fix Aura can't provide accurate cursor hotspot info.

ui/base/cursor/cursor_loader_x11.cc

Index: ui/base/cursor/cursor_loader_x11.cc
diff --git a/ui/base/cursor/cursor_loader_x11.cc b/ui/base/cursor/cursor_loader_x11.cc
index 1929d9fe7d25954daf53e433b52aecdb88c32c0d..3aacfa2f5fd0a048805ae51fb752261065ab1f9c 100644
--- a/ui/base/cursor/cursor_loader_x11.cc
+++ b/ui/base/cursor/cursor_loader_x11.cc
@@ -284,6 +284,7 @@ void CursorLoaderX11::SetPlatformCursor(gfx::NativeCursor* cursor) {
   if (*cursor == kCursorCustom)
     return;
 
+  cursor->set_device_scale_factor(scale());
   cursor->SetPlatformCursor(CursorFromId(cursor->native_type()));
 }