Revert of Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc b/third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc
index 7236771ff28a86b5ceb1629f0f295aff83805221..8095527a3133227d1e60c8884926f07849fc65dc 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc
@@ -13,7 +13,6 @@
 #include "base/pending_task.h"
 #include "base/threading/platform_thread.h"
 #include "platform/scheduler/child/compositor_worker_scheduler.h"
-#include "platform/scheduler/child/scheduler_tqm_delegate_impl.h"
 #include "platform/scheduler/child/webthread_impl_for_worker_scheduler.h"
 #include "platform/scheduler/utility/webthread_impl_for_utility_thread.h"
 #include "public/platform/WebTraceLocation.h"
@@ -118,8 +117,7 @@
   // WebThreadImplForWorkerScheduler:
   std::unique_ptr<blink::scheduler::WorkerScheduler> CreateWorkerScheduler()
       override {
-    return base::MakeUnique<CompositorWorkerScheduler>(GetThread(),
-                                                       task_runner_delegate());
+    return base::MakeUnique<CompositorWorkerScheduler>(GetThread());
   }
 
   DISALLOW_COPY_AND_ASSIGN(WebThreadForCompositor);