Make nesting/running states a RunLoop rather than a MessageLoop concept.

third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc b/third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc
index 007dd53947faa8eb102c499996ab7b1d2cd8ab37..ffbdb775fc689ac2d6449bd204a6001a978d543e 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_impl.cc
@@ -6,6 +6,8 @@
 
 #include <utility>
 
+#include "base/run_loop.h"
+
 namespace blink {
 namespace scheduler {
 
@@ -59,17 +61,18 @@ bool SchedulerTqmDelegateImpl::RunsTasksOnCurrentThread() const {
 }
 
 bool SchedulerTqmDelegateImpl::IsNested() const {
-  return message_loop_->IsNested();
+  DCHECK(RunsTasksOnCurrentThread());
+  return base::RunLoop::IsNestedOnCurrentThread();
 }
 
 void SchedulerTqmDelegateImpl::AddNestingObserver(
-    base::MessageLoop::NestingObserver* observer) {
-  message_loop_->AddNestingObserver(observer);
+    base::RunLoop::NestingObserver* observer) {
+  base::RunLoop::AddNestingObserverOnCurrentThread(observer);
 }
 
 void SchedulerTqmDelegateImpl::RemoveNestingObserver(
-    base::MessageLoop::NestingObserver* observer) {
-  message_loop_->RemoveNestingObserver(observer);
+    base::RunLoop::NestingObserver* observer) {
+  base::RunLoop::RemoveNestingObserverOnCurrentThread(observer);
 }
 
 base::TimeTicks SchedulerTqmDelegateImpl::NowTicks() {