Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.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 "chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h"
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 237 matching lines @@
 }
 
 void ClearBrowsingDataHandler::HandleInitialize(const base::ListValue* args) {
   AllowJavascript();
   const base::Value* callback_id;
   CHECK(args->Get(0, &callback_id));
 
   // Needed because WebUI doesn't handle renderer crashes. See crbug.com/610450.
   task_observer_.reset();
 
-  OnStateChanged();
+  OnStateChanged(nullptr);

[sky, 2017/01/27 16:29:44]

Same comment above using another function.

[Steven Holte, 2017/01/27 20:11:45]

Done.

   RefreshHistoryNotice();
 
   // Restart the counters each time the dialog is reopened.
   for (const auto& counter : counters_)
     counter->Restart();
 
   ResolveJavascriptCallback(
       *callback_id,
       *base::Value::CreateNullValue() /* Promise<void> */);
 }
 
-void ClearBrowsingDataHandler::OnStateChanged() {
+void ClearBrowsingDataHandler::OnStateChanged(syncer::SyncService* sync) {
   CallJavascriptFunction(
       "cr.webUIListenerCallback",
       base::StringValue("update-footer"),
       base::FundamentalValue(sync_service_ && sync_service_->IsSyncActive()),
       base::FundamentalValue(show_history_footer_));
 }
 
 void ClearBrowsingDataHandler::RefreshHistoryNotice() {
   browsing_data::ShouldShowNoticeAboutOtherFormsOfBrowsingHistory(
       sync_service_,
@@ skipping 12 matching lines @@
         sync_service_,
         WebHistoryServiceFactory::GetForProfile(profile_),
         chrome::GetChannel(),
         base::Bind(&ClearBrowsingDataHandler::UpdateHistoryDeletionDialog,
                    weak_ptr_factory_.GetWeakPtr()));
   }
 }
 
 void ClearBrowsingDataHandler::UpdateHistoryNotice(bool show) {
   show_history_footer_ = show;
-  OnStateChanged();
+  OnStateChanged(nullptr);
 
   UMA_HISTOGRAM_BOOLEAN(
       "History.ClearBrowsingData.HistoryNoticeShownInFooterWhenUpdated",
       show_history_footer_);
 }
 
 void ClearBrowsingDataHandler::UpdateHistoryDeletionDialog(bool show) {
   // This is used by OnClearingTaskFinished (when the deletion finishes).
   show_history_deletion_dialog_ = show;
 }
 
 void ClearBrowsingDataHandler::AddCounter(
     std::unique_ptr<browsing_data::BrowsingDataCounter> counter) {
   counter->Init(profile_->GetPrefs(),
                 base::Bind(&ClearBrowsingDataHandler::UpdateCounterText,
                            base::Unretained(this)));
   counters_.push_back(std::move(counter));
 }
 
 void ClearBrowsingDataHandler::UpdateCounterText(
     std::unique_ptr<browsing_data::BrowsingDataCounter::Result> result) {
   CallJavascriptFunction(
       "cr.webUIListenerCallback",
       base::StringValue("update-counter-text"),
       base::StringValue(result->source()->GetPrefName()),
       base::StringValue(GetChromeCounterTextFromResult(result.get())));
 }
 
 }  // namespace settings