Plumb the referrer throughout the OpenURL APIs....

chrome/browser/web_drop_target.cc

 // Copyright (c) 2006-2008 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 <windows.h>
 #include <shlobj.h>
 
 #include "chrome/browser/web_drop_target.h"
 
 #include "base/clipboard_util.h"
@@ skipping 40 matching lines @@
   }
 
   void OnDragLeave(IDataObject* data_object) {
   }
 
   DWORD OnDrop(IDataObject* data_object, DWORD effect) {
     if (ClipboardUtil::HasUrl(data_object)) {
       std::wstring url;
       std::wstring title;
       ClipboardUtil::GetUrl(data_object, &url, &title);
-      web_contents_->OpenURL(GURL(url), CURRENT_TAB,
+      web_contents_->OpenURL(GURL(url), GURL(), CURRENT_TAB,
                              PageTransition::AUTO_BOOKMARK);
       return GetPreferredDropEffect(effect);
     }
     return DROPEFFECT_NONE;
   }
 
  private:
   WebContents* web_contents_;
 
   DISALLOW_EVIL_CONSTRUCTORS(InterstitialDropTarget);
@@ skipping 82 matching lines @@
   ScreenToClient(GetHWND(), &client_pt);
   web_contents_->render_view_host()->DragTargetDrop(
       gfx::Point(client_pt.x, client_pt.y),
       gfx::Point(cursor_position.x, cursor_position.y));
 
   // We lie and always claim that the drop operation didn't happen because we
   // don't want to wait for the renderer to respond.
   return DROPEFFECT_NONE;
 }