[scheduler] Remove blink::scheduler::TaskQueue from public API.

third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
index 6a1ef9e45a518331434925f568da67fb9ec447bf..aa744aa3743c407d5cf88718edc90fb1fd266d07 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
@@ -6,12 +6,12 @@
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_WORKER_SCHEDULER_IMPL_H_
 
 #include "base/macros.h"
+#include "platform/scheduler/base/task_time_observer.h"
 #include "platform/scheduler/base/thread_load_tracker.h"
 #include "platform/scheduler/child/idle_canceled_delayed_task_sweeper.h"
 #include "platform/scheduler/child/idle_helper.h"
 #include "platform/scheduler/child/scheduler_helper.h"
 #include "platform/scheduler/child/worker_scheduler.h"
-#include "public/platform/scheduler/base/task_time_observer.h"
 
 namespace blink {
 namespace scheduler {
@@ -27,7 +27,8 @@ class BLINK_PLATFORM_EXPORT WorkerSchedulerImpl : public WorkerScheduler,
   ~WorkerSchedulerImpl() override;
 
   // WorkerScheduler implementation:
-  scoped_refptr<TaskQueue> DefaultTaskRunner() override;
+  scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() override;
+  scoped_refptr<TaskQueue> DefaultTaskQueue() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
   bool CanExceedIdleDeadlineIfRequired() const override;
   bool ShouldYieldForHighPriorityWork() override;