Mark drags starting in web content as tainted to avoid file path forgery

ui/base/dragdrop/os_exchange_data_provider_win.h

Index: ui/base/dragdrop/os_exchange_data_provider_win.h
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.h b/ui/base/dragdrop/os_exchange_data_provider_win.h
index 111ef3b9b898cadfd54915e8ed641eba67f3fc13..7c3ce5c103798152b440cabd585f1658b1cbc5e3 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.h
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.h
@@ -149,6 +149,8 @@ class UI_BASE_EXPORT OSExchangeDataProviderWin
 
   // OSExchangeData::Provider methods.
   virtual Provider* Clone() const;
+  virtual void MarkOriginatedFromRenderer();
+  virtual bool DidOriginateFromRenderer() const;
   virtual void SetString(const base::string16& data);
   virtual void SetURL(const GURL& url, const base::string16& title);
   virtual void SetFilename(const base::FilePath& path);