Delete from Sync the artificial search engines created by the omnibox extensions.

ios/chrome/browser/search_engines/template_url_service_client_impl.cc

 // Copyright 2015 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 "ios/chrome/browser/search_engines/template_url_service_client_impl.h"
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/history/core/browser/history_types.h"
@@ skipping 50 matching lines @@
 }
 
 void TemplateURLServiceClientImpl::AddKeywordGeneratedVisit(const GURL& url) {
   if (history_service_) {
     history_service_->AddPage(
         url, base::Time::Now(), nullptr, 0, GURL(), history::RedirectList(),
         ui::PAGE_TRANSITION_KEYWORD_GENERATED, history::SOURCE_BROWSED, false);
   }
 }
 
-void TemplateURLServiceClientImpl::RestoreExtensionInfoIfNecessary(
-    TemplateURL* template_url) {
-  // iOS does not supports extension, nothing to do.
+bool TemplateURLServiceClientImpl::IsOmniboxExtensionURL(
+    const std::string& url) {
+  // iOS does not supports extension.

[Peter Kasting, 2016/10/05 00:15:21]

Nit: "iOS does not support extensions."

[vasilii, 2016/10/05 12:03:48]

Done.

+  return false;
 }
 
 void TemplateURLServiceClientImpl::OnURLVisited(
     history::HistoryService* history_service,
     ui::PageTransition transition,
     const history::URLRow& row,
     const history::RedirectList& redirects,
     base::Time visit_time) {
   DCHECK_EQ(history_service, history_service_);
   if (!owner_)
     return;
 
   TemplateURLService::URLVisitedDetails details = {
       row.url(),
       ui::PageTransitionCoreTypeIs(transition, ui::PAGE_TRANSITION_KEYWORD),
   };
   owner_->OnHistoryURLVisited(details);
 }
 
 }  // namespace ios