Add RetainedRef uses where needed.

components/history/core/browser/top_sites_impl.cc

 // Copyright (c) 2013 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/history/core/browser/top_sites_impl.h"
 
 #include <stdint.h>
 #include <algorithm>
 #include <set>
 #include <utility>
@@ skipping 199 matching lines @@
 // WARNING: this function may be invoked on any thread.
 void TopSitesImpl::GetMostVisitedURLs(
     const GetMostVisitedURLsCallback& callback,
     bool include_forced_urls) {
   MostVisitedURLList filtered_urls;
   {
     base::AutoLock lock(lock_);
     if (!loaded_) {
       // A request came in before we finished loading. Store the callback and
       // we'll run it on current thread when we finish loading.
-      pending_callbacks_.push_back(base::Bind(
-          &RunOrPostGetMostVisitedURLsCallback,
-          base::ThreadTaskRunnerHandle::Get(), include_forced_urls, callback));
+      pending_callbacks_.push_back(
+          base::Bind(&RunOrPostGetMostVisitedURLsCallback,
+                     base::RetainedRef(base::ThreadTaskRunnerHandle::Get()),
+                     include_forced_urls, callback));
       return;
     }
     if (include_forced_urls) {
       filtered_urls = thread_safe_cache_->top_sites();
     } else {
       filtered_urls.assign(thread_safe_cache_->top_sites().begin() +
                               thread_safe_cache_->GetNumForcedURLs(),
                            thread_safe_cache_->top_sites().end());
     }
   }
@@ skipping 701 matching lines @@
     for (std::set<size_t>::reverse_iterator i = indices_to_delete.rbegin();
          i != indices_to_delete.rend(); i++) {
       new_top_sites.erase(new_top_sites.begin() + *i);
     }
     SetTopSites(new_top_sites, CALL_LOCATION_FROM_OTHER_PLACES);
   }
   StartQueryForMostVisited();
 }
 
 }  // namespace history