Add RetainedRef uses where needed.

components/history/core/browser/top_sites_impl.cc

Index: components/history/core/browser/top_sites_impl.cc
diff --git a/components/history/core/browser/top_sites_impl.cc b/components/history/core/browser/top_sites_impl.cc
index fb8e080a2045e60a1f63894885465430ba753e8d..2133076db6575220fbb91d728882b76fd5d70f61 100644
--- a/components/history/core/browser/top_sites_impl.cc
+++ b/components/history/core/browser/top_sites_impl.cc
@@ -217,9 +217,10 @@ void TopSitesImpl::GetMostVisitedURLs(
     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) {