[Downloads] Consolidate MOTW annotation APIs into a single API.

content/browser/download/quarantine.cc

 // Copyright 2016 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.
 
-#ifndef CONTENT_PUBLIC_COMMON_ZYGOTE_HANDLE_H_
-#define CONTENT_PUBLIC_COMMON_ZYGOTE_HANDLE_H_
-
-#include <cstddef>
+#include "content/browser/download/quarantine.h"
 
 #include "build/build_config.h"
 
+#if !defined(OS_WIN) && !defined(OS_MACOSX) && !defined(OS_LINUX)
+
 namespace content {
 
-#if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
-class ZygoteCommunication;
-using ZygoteHandle = ZygoteCommunication*;
-#else
-using ZygoteHandle = std::nullptr_t;
-#endif
+QuarantineFileResult QuarantineFile(const base::FilePath& file,
+                                    const GURL& source_url,
+                                    const GURL& referrer_url,
+                                    const std::string& client_guid) {
+  return QuarantineFileResult::OK;
+}
 
-}  // namespace content
+} // namespace content
 
-#endif  // CONTENT_PUBLIC_COMMON_ZYGOTE_HANDLE_H_
+#endif // !WIN && !MAC && !LINUX