Revert of Fixing renderer's access to a file from HTTP POST (after a xsite transfer).

content/common/resource_request_body_impl.h

Index: content/common/resource_request_body_impl.h
diff --git a/content/common/resource_request_body_impl.h b/content/common/resource_request_body_impl.h
index 4cc8ad04b8bf709812c7ff6281abf83c13ab635c..81e46d18dfb5b4d269f91dc03343f8be7b463b95 100644
--- a/content/common/resource_request_body_impl.h
+++ b/content/common/resource_request_body_impl.h
@@ -55,9 +55,6 @@
   void set_identifier(int64_t id) { identifier_ = id; }
   int64_t identifier() const { return identifier_; }
 
-  // Returns paths referred to by |elements| of type Element::TYPE_FILE.
-  std::vector<base::FilePath> GetReferencedFiles() const;
-
  private:
   ~ResourceRequestBodyImpl() override;