Revert of SafeBrowsing: DatabaseManager owns the V4GetHashProtocolManager

components/safe_browsing_db/database_manager.h

Index: components/safe_browsing_db/database_manager.h
diff --git a/components/safe_browsing_db/database_manager.h b/components/safe_browsing_db/database_manager.h
index 0bebc37d4f0d82b34f70ac25de72385b5d8339e0..4924cacb32503fd883bdb906f0c620691e6205af 100644
--- a/components/safe_browsing_db/database_manager.h
+++ b/components/safe_browsing_db/database_manager.h
@@ -20,14 +20,7 @@
 #include "content/public/common/resource_type.h"
 #include "url/gurl.h"
 
-namespace net {
-class URLRequestContextGetter;
-}  // namespace net
-
 namespace safe_browsing {
-
-struct V4GetHashProtocolConfig;
-class V4GetHashProtocolManager;
 
 // Base class to either the locally-managed or a remotely-managed database.
 class SafeBrowsingDatabaseManager
@@ -153,19 +146,9 @@
   virtual void StopOnIOThread(bool shutdown) = 0;
 
  protected:
-  // Use this constructor for testing only.
-  SafeBrowsingDatabaseManager();
-
-  // Constructs the database manager.
-  SafeBrowsingDatabaseManager(
-      net::URLRequestContextGetter* request_context_getter,
-      const V4GetHashProtocolConfig& config);
-
-  virtual ~SafeBrowsingDatabaseManager();
+  virtual ~SafeBrowsingDatabaseManager() {}
 
   friend class base::RefCountedThreadSafe<SafeBrowsingDatabaseManager>;
-
-  std::unique_ptr<V4GetHashProtocolManager> v4_get_hash_protocol_manager_;
 };  // class SafeBrowsingDatabaseManager
 
 }  // namespace safe_browsing