scheduler: Move the Blink scheduler into Blink

content/child/resource_scheduling_filter.h

Index: content/child/resource_scheduling_filter.h
diff --git a/content/child/resource_scheduling_filter.h b/content/child/resource_scheduling_filter.h
index 93d243c90238a9d2b2794a36558cbf97542ca40f..ddd7ec33a3b7405428f88170e2dff43ec6b8a8c8 100644
--- a/content/child/resource_scheduling_filter.h
+++ b/content/child/resource_scheduling_filter.h
@@ -17,10 +17,6 @@
 #include "content/common/content_export.h"
 #include "ipc/message_filter.h"
 
-namespace blink {
-class WebTaskRunner;
-}
-
 namespace content {
 class ResourceDispatcher;
 
@@ -41,7 +37,7 @@ class CONTENT_EXPORT ResourceSchedulingFilter : public IPC::MessageFilter {
   // Sets the task runner associated with request messages with |id|.
   void SetRequestIdTaskRunner(
       int id,
-      std::unique_ptr<blink::WebTaskRunner> web_task_runner);
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
 
   // Removes the task runner associated with |id|.
   void ClearRequestIdTaskRunner(int id);
@@ -52,7 +48,7 @@ class CONTENT_EXPORT ResourceSchedulingFilter : public IPC::MessageFilter {
   ~ResourceSchedulingFilter() override;
 
   using RequestIdToTaskRunnerMap =
-      std::map<int, std::unique_ptr<blink::WebTaskRunner>>;
+      std::map<int, scoped_refptr<base::SingleThreadTaskRunner>>;
 
   // This lock guards |request_id_to_task_runner_map_|
   base::Lock request_id_to_task_runner_map_lock_;