Revert of Move remote_db_manager into the safe_browsing_db component.

components/safe_browsing_db/safe_browsing_api_handler.h

-// Copyright 2015 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.
-//
-// Glue to pass Safe Browsing API requests between
-// RemoteSafeBrowsingDatabaseManager and Java-based API to check URLs.
-
-#ifndef COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_API_HANDLER_H_
-#define COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_API_HANDLER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "components/safe_browsing_db/util.h"
-#include "url/gurl.h"
-
-namespace safe_browsing {
-
-class SafeBrowsingApiHandler {
- public:
-  // Singleton interface.
-  static void SetInstance(SafeBrowsingApiHandler* instance);
-  static SafeBrowsingApiHandler* GetInstance();
-
-  typedef base::Callback<void(SBThreatType sb_threat_type,
-                              const std::string& metadata)> URLCheckCallback;
-
-  // Makes Native->Java call and invokes callback when check is done.
-  virtual void StartURLCheck(const URLCheckCallback& callback,
-                             const GURL& url,
-                             const std::vector<SBThreatType>& threat_types) = 0;
-
-  virtual ~SafeBrowsingApiHandler() {}
-
- private:
-  // Pointer not owned.
-  static SafeBrowsingApiHandler* instance_;
-};
-
-}  // namespace safe_browsing
-
-#endif  // COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_API_HANDLER_H_