Adding a DownloadRestrictions group policy.

content/browser/download/download_item_impl.h

Index: content/browser/download/download_item_impl.h
diff --git a/content/browser/download/download_item_impl.h b/content/browser/download/download_item_impl.h
index c899f25016b113ef24356a9f5cb565b2d8be20e4..49cb205783347ca3e6c0adac3345ff1655c8cd18 100644
--- a/content/browser/download/download_item_impl.h
+++ b/content/browser/download/download_item_impl.h
@@ -9,6 +9,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
@@ -160,7 +161,8 @@ class CONTENT_EXPORT DownloadItemImpl
   bool GetOpened() const override;
   BrowserContext* GetBrowserContext() const override;
   WebContents* GetWebContents() const override;
-  void OnContentCheckCompleted(DownloadDangerType danger_type) override;
+  void OnContentCheckCompleted(DownloadDangerType danger_type,
+                               bool block_file) override;
   void SetOpenWhenComplete(bool open) override;
   void SetOpened(bool opened) override;
   void SetDisplayName(const base::FilePath& name) override;