sync: remove use of protobuf extensions in protocol to reduce static init overhead.

chrome/browser/sync/engine/syncapi_internal.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/sync/engine/syncapi_internal.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sync/util/cryptographer.h"
 #include "chrome/browser/sync/protocol/password_specifics.pb.h"
+#include "chrome/browser/sync/protocol/sync.pb.h"
 
 using browser_sync::Cryptographer;
 
 namespace sync_api {
 
 sync_pb::PasswordSpecificsData* DecryptPasswordSpecifics(
     const sync_pb::EntitySpecifics& specifics, Cryptographer* crypto) {
-  if (!specifics.HasExtension(sync_pb::password))
+  if (!specifics.has_password())
     return NULL;
-  const sync_pb::PasswordSpecifics& password_specifics =
-      specifics.GetExtension(sync_pb::password);
+  const sync_pb::PasswordSpecifics& password_specifics = specifics.password();
   if (!password_specifics.has_encrypted())
     return NULL;
   const sync_pb::EncryptedData& encrypted = password_specifics.encrypted();
   scoped_ptr<sync_pb::PasswordSpecificsData> data(
       new sync_pb::PasswordSpecificsData);
   if (!crypto->Decrypt(encrypted, data.get()))
     return NULL;
   return data.release();
 }
 
@@ skipping 47 matching lines @@
   } else {
     right_plaintext = right.SerializeAsString();
   }
   if (left_plaintext == right_plaintext) {
     return true;
   }
   return false;
 }
 
 } // namespace sync_api