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

chrome/browser/sync/engine/build_commit_command.cc

 // Copyright (c) 2012 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/build_commit_command.h"
 
 #include <limits>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 161 matching lines @@
       DCHECK(id.ServerKnows()) << meta_entry;
       sync_entry->set_version(meta_entry.Get(syncable::BASE_VERSION));
     }
     sync_entry->set_ctime(TimeToProtoTime(meta_entry.Get(syncable::CTIME)));
     sync_entry->set_mtime(TimeToProtoTime(meta_entry.Get(syncable::MTIME)));
 
     // Deletion is final on the server, let's move things and then delete them.
     if (meta_entry.Get(IS_DEL)) {
       sync_entry->set_deleted(true);
     } else {
-      if (meta_entry.Get(SPECIFICS).HasExtension(sync_pb::bookmark)) {
+      if (meta_entry.Get(SPECIFICS).has_bookmark()) {
         // Common data in both new and old protocol.
         const Id& prev_id = meta_entry.Get(syncable::PREV_ID);
         string prev_id_string =
             prev_id.IsRoot() ? string() : prev_id.GetServerId();
         sync_entry->set_insert_after_item_id(prev_id_string);
 
         // Compute a numeric position based on what we know locally.
         std::pair<int64, int64> position_block(
             GetFirstPosition(), GetLastPosition());
         std::map<Id, std::pair<int64, int64> >::iterator prev_pos =
@@ skipping 53 matching lines @@
   if (delta <= static_cast<uint64>(GetGap()*2))
     return lo + (static_cast<int64>(delta) + 7) / 8;  // Interpolate.
   else if (lo == GetFirstPosition())
     return hi - GetGap();  // Extend range just before successor.
   else
     return lo + GetGap();  // Use or extend range just after predecessor.
 }
 
 
 }  // namespace browser_sync