Add RetainedRef uses where needed.

chrome/browser/supervised_user/supervised_user_service.cc

 // Copyright 2014 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/supervised_user/supervised_user_service.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 459 matching lines @@
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&SupervisedUserURLFilter::Clear,
                  io_url_filter_));
 }
 
 void SupervisedUserService::URLFilterContext::InitAsyncURLChecker(
     const scoped_refptr<net::URLRequestContextGetter>& context) {
   ui_url_filter_->InitAsyncURLChecker(context.get());
   BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(&SupervisedUserURLFilter::InitAsyncURLChecker,
-                 io_url_filter_, context));
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&SupervisedUserURLFilter::InitAsyncURLChecker, io_url_filter_,
+                 base::RetainedRef(context)));
 }
 
 bool SupervisedUserService::URLFilterContext::HasAsyncURLChecker() const {
   return ui_url_filter_->HasAsyncURLChecker();
 }
 
 void SupervisedUserService::URLFilterContext::ClearAsyncURLChecker() {
   ui_url_filter_->ClearAsyncURLChecker();
   BrowserThread::PostTask(
       BrowserThread::IO,
@@ skipping 551 matching lines @@
     content::RecordAction(UserMetricsAction("ManagedUsers_SwitchProfile"));
 
   is_profile_active_ = profile_became_active;
 }
 #endif  // !defined(OS_ANDROID)
 
 void SupervisedUserService::OnSiteListUpdated() {
   FOR_EACH_OBSERVER(
       SupervisedUserServiceObserver, observer_list_, OnURLFilterChanged());
 }