Move common PVer4 code into a V4ProtocolManagerUtil class.

components/safe_browsing_db/database_manager.cc

Index: components/safe_browsing_db/database_manager.cc
diff --git a/components/safe_browsing_db/database_manager.cc b/components/safe_browsing_db/database_manager.cc
index 6412cf0aea8f2f3a1537ce363d023c5ce74f1d40..be1fcf87ac4f43b4684a6c67f8d12d48affa6267 100644
--- a/components/safe_browsing_db/database_manager.cc
+++ b/components/safe_browsing_db/database_manager.cc
@@ -11,12 +11,12 @@
 namespace safe_browsing {
 
 SafeBrowsingDatabaseManager::SafeBrowsingDatabaseManager()
-    : SafeBrowsingDatabaseManager(NULL, V4GetHashProtocolConfig()) {
+    : SafeBrowsingDatabaseManager(NULL, V4ProtocolConfig()) {
 }
 
 SafeBrowsingDatabaseManager::SafeBrowsingDatabaseManager(
     net::URLRequestContextGetter* request_context_getter,
-    const V4GetHashProtocolConfig& config) {
+    const V4ProtocolConfig& config) {
   // Instantiate a V4GetHashProtocolManager.
   if (request_context_getter) {
     v4_get_hash_protocol_manager_.reset(V4GetHashProtocolManager::Create(