Fix drop event location being incorrect at hidpi.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 2288 matching lines @@
 }
 
 void RenderViewImpl::OnDragTargetDragLeave() {
   webview()->dragTargetDragLeave();
 }
 
 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);
 }
 
 void RenderViewImpl::OnDragSourceEnded(const gfx::Point& client_point,
                                        const gfx::Point& screen_point,
                                        WebDragOperation op) {
   webview()->dragSourceEndedAt(
       ConvertWindowPointToViewport(client_point), screen_point, op);
 }
 
@@ skipping 702 matching lines @@
         return render_frame->focused_pepper_plugin();
     }
     frame = frame->traverseNext(false);
   }
 
   return nullptr;
 }
 #endif
 
 }  // namespace content