[Autofill] Run autofill-profile de-dupe after sync starts if sync is enabled.

components/autofill/core/browser/webdata/autocomplete_syncable_service.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 "components/autofill/core/browser/webdata/autocomplete_syncable_service.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/location.h"
@@ skipping 140 matching lines @@
   merge_result.set_error(
       sync_processor_->ProcessSyncChanges(FROM_HERE, new_changes));
 
   // This will schedule a deletion operation on the DB thread, which will
   // trigger a notification to propagate the deletion to Sync.
   // NOTE: This must be called *after* the ProcessSyncChanges call above.
   // Otherwise, an item that Sync is not yet aware of might expire, causing a
   // Sync error when that item's deletion is propagated to Sync.
   web_data_backend_->RemoveExpiredFormElements();
 
+  web_data_backend_->NotifyThatSyncHasStarted(type);
+
   return merge_result;
 }
 
 void AutocompleteSyncableService::StopSyncing(syncer::ModelType type) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(syncer::AUTOFILL, type);
 
   sync_processor_.reset();
   error_handler_.reset();
 }
@@ skipping 246 matching lines @@
 }
 
 // static
 std::string AutocompleteSyncableService::KeyToTag(const std::string& name,
                                                   const std::string& value) {
   std::string prefix(kAutofillEntryNamespaceTag);
   return prefix + net::EscapePath(name) + "|" + net::EscapePath(value);
 }
 
 }  // namespace autofill