components: Cleanup class/struct fwd declarations

components/safe_browsing_db/test_database_manager.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.
 
 #ifndef COMPONENTS_SAFE_BROWSING_DB_TEST_DATABASE_MANAGER_H_
 #define COMPONENTS_SAFE_BROWSING_DB_TEST_DATABASE_MANAGER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "components/safe_browsing_db/database_manager.h"
 
-namespace net {
-class URLRequestContextGetter;
-}
-
 namespace safe_browsing {
 
-struct V4ProtocolConfig;
-
 // This is a non-pure-virtual implementation of the SafeBrowsingDatabaseManager
 // interface.  It's used in tests by overriding only the functions that get
 // called, and it'll complain if you call one that isn't overriden. The
 // non-abstract methods in the base class are not overridden.
 class TestSafeBrowsingDatabaseManager
     : public SafeBrowsingDatabaseManager {
  public:
   // SafeBrowsingDatabaseManager implementation:
   void CancelCheck(Client* client) override;
   bool CanCheckResourceType(content::ResourceType resource_type) const override;
@@ skipping 16 matching lines @@
   bool IsMalwareKillSwitchOn() override;
   bool IsSupported() const override;
 
  protected:
   ~TestSafeBrowsingDatabaseManager() override {};
 };
 
 }  // namespace safe_browsing
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_TEST_DATABASE_MANAGER_H_