Remove MessageLoop::current() from base_session_service.cc.

components/sessions/core/base_session_service.cc

Index: components/sessions/core/base_session_service.cc
diff --git a/components/sessions/core/base_session_service.cc b/components/sessions/core/base_session_service.cc
index 3883b0cde372ac658e87a54069907e11ad008888..edc2431507c16ed56108b87220e30ad688b636b3 100644
--- a/components/sessions/core/base_session_service.cc
+++ b/components/sessions/core/base_session_service.cc
@@ -117,8 +117,8 @@ void BaseSessionService::ClearPendingCommands() {
 
 void BaseSessionService::StartSaveTimer() {
   // Don't start a timer when testing.
-  if (delegate_->ShouldUseDelayedSave() && base::MessageLoop::current() &&
-      !weak_factory_.HasWeakPtrs()) {
+  if (delegate_->ShouldUseDelayedSave() &&
+      base::ThreadTaskRunnerHandle::IsSet() && !weak_factory_.HasWeakPtrs()) {
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&BaseSessionService::Save, weak_factory_.GetWeakPtr()),