Fix drop event location being incorrect at hidpi.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 4513fdd653df86cce6749b766571eebd2e6d4846..81b026734494be74b074cf3afbc920312094e942 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2325,7 +2325,8 @@ void RenderViewImpl::OnDragTargetDrop(const DropData& drop_data,
                                       const gfx::Point& client_point,
                                       const gfx::Point& screen_point,
                                       int key_modifiers) {
-  webview()->dragTargetDrop(DropDataToWebDragData(drop_data), client_point,
+  webview()->dragTargetDrop(DropDataToWebDragData(drop_data),
+                            ConvertWindowPointToViewport(client_point),
                             screen_point, key_modifiers);
 }