Revert of [Reland] Optimize blink scheduler with an intrusive heap

third_party/WebKit/Source/platform/scheduler/base/work_queue.h

Index: third_party/WebKit/Source/platform/scheduler/base/work_queue.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/work_queue.h b/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
index 998fc62d03c55c0d9cad243b1dbd353a69a66ef0..f6e520608d1855941e0b794b58fff0060ded7122 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
@@ -12,7 +12,6 @@
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "platform/scheduler/base/enqueue_order.h"
-#include "platform/scheduler/base/intrusive_heap.h"
 #include "platform/scheduler/base/task_queue_impl.h"
 
 namespace blink {
@@ -83,10 +82,6 @@
 
   size_t work_queue_set_index() const { return work_queue_set_index_; }
 
-  HeapHandle heap_handle() const { return heap_handle_; }
-
-  void set_heap_handle(HeapHandle handle) { heap_handle_ = handle; }
-
   // Test support function. This should not be used in production code.
   void PopTaskForTest();
 
@@ -117,7 +112,6 @@
   WorkQueueSets* work_queue_sets_;  // NOT OWNED.
   TaskQueueImpl* task_queue_;       // NOT OWNED.
   size_t work_queue_set_index_;
-  HeapHandle heap_handle_;
   const char* name_;
   EnqueueOrder fence_;