Move common PVer4 code into a V4ProtocolManagerUtil class.

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 6ee8cbd48cd568c7f4df2b536a7e5c08db7c6f6d..19f18de6ade585e379cbd718e105b71a2bd066b9 100644
--- a/components/safe_browsing_db/database_manager.h
+++ b/components/safe_browsing_db/database_manager.h
@@ -26,7 +26,7 @@ class URLRequestContextGetter;
 
 namespace safe_browsing {
 
-struct V4GetHashProtocolConfig;
+struct V4ProtocolConfig;
 class V4GetHashProtocolManager;
 
 // Base class to either the locally-managed or a remotely-managed database.
@@ -175,7 +175,7 @@ class SafeBrowsingDatabaseManager
   // Constructs the database manager.
   SafeBrowsingDatabaseManager(
       net::URLRequestContextGetter* request_context_getter,
-      const V4GetHashProtocolConfig& config);
+      const V4ProtocolConfig& config);
 
   virtual ~SafeBrowsingDatabaseManager();