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

chrome/browser/sync/profile_sync_service_autofill_unittest.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 <set>
 #include <string>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 433 matching lines @@
 
     sync_api::WriteNode node(&trans);
     std::string tag = AutocompleteSyncableService::KeyToTag(
         UTF16ToUTF8(entry.key().name()), UTF16ToUTF8(entry.key().value()));
     if (!node.InitUniqueByCreation(syncable::AUTOFILL, autofill_root, tag))
       return false;
 
     sync_pb::EntitySpecifics specifics;
     AutocompleteSyncableService::WriteAutofillEntry(entry, &specifics);
     sync_pb::AutofillSpecifics* autofill_specifics =
-        specifics.MutableExtension(sync_pb::autofill);
+        specifics.mutable_autofill();
     node.SetAutofillSpecifics(*autofill_specifics);
     return true;
   }
 
   bool AddAutofillSyncNode(const AutofillProfile& profile) {
     sync_api::WriteTransaction trans(FROM_HERE, service_->GetUserShare());
     sync_api::ReadNode autofill_root(&trans);
     if (!autofill_root.InitByTagLookup(kAutofillProfileTag))
       return false;
     sync_api::WriteNode node(&trans);
     std::string tag = profile.guid();
     if (!node.InitUniqueByCreation(syncable::AUTOFILL_PROFILE,
                                    autofill_root, tag))
       return false;
     sync_pb::EntitySpecifics specifics;
     AutofillProfileSyncableService::WriteAutofillProfile(profile, &specifics);
     sync_pb::AutofillProfileSpecifics* profile_specifics =
-        specifics.MutableExtension(sync_pb::autofill_profile);
+        specifics.mutable_autofill_profile();
     node.SetAutofillProfileSpecifics(*profile_specifics);
     return true;
   }
 
   bool GetAutofillEntriesFromSyncDB(std::vector<AutofillEntry>* entries,
                                     std::vector<AutofillProfile>* profiles) {
     sync_api::ReadTransaction trans(FROM_HERE, service_->GetUserShare());
     sync_api::ReadNode autofill_root(&trans);
     if (!autofill_root.InitByTagLookup(
             syncable::ModelTypeToRootTag(syncable::AUTOFILL)))
@@ skipping 170 matching lines @@
     sync_pb::AutofillSpecifics new_autofill;
     new_autofill.set_name(UTF16ToUTF8(entry_.key().name()));
     new_autofill.set_value(UTF16ToUTF8(entry_.key().value()));
     const std::vector<base::Time>& ts(entry_.timestamps());
     for (std::vector<base::Time>::const_iterator timestamp = ts.begin();
          timestamp != ts.end(); ++timestamp) {
       new_autofill.add_usage_timestamp(timestamp->ToInternalValue());
     }
 
     sync_pb::EntitySpecifics entity_specifics;
-    entity_specifics.MutableExtension(sync_pb::autofill)->
-        CopyFrom(new_autofill);
+    entity_specifics.mutable_autofill()->CopyFrom(new_autofill);
 
     {
       // Tell main thread we've started
       (*wait_for_start_)->Signal();
 
       // Create write transaction.
       WriteTransactionTest trans(FROM_HERE, UNITTEST, directory,
                                  wait_for_syncapi_);
 
       // Create actual entry based on autofill protobuf information.
@@ skipping 554 matching lines @@
   std::vector<AutofillEntry> sync_entries;
   std::vector<AutofillProfile> sync_profiles;
   ASSERT_TRUE(GetAutofillEntriesFromSyncDB(&sync_entries, &sync_profiles));
   EXPECT_EQ(3U, sync_entries.size());
   EXPECT_EQ(0U, sync_profiles.size());
   for (size_t i = 0; i < sync_entries.size(); i++) {
     DVLOG(1) << "Entry " << i << ": " << sync_entries[i].key().name()
              << ", " << sync_entries[i].key().value();
   }
 }