Introduce EmbedderReachableReferenceReporter

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index e999ebf31e51d128fb561f74babb249c0998b48b..5e28afec6895543dc116f693f8898c718a1411d8 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -490,24 +490,6 @@ class MarkCompactCollector {
 
   Sweeper& sweeper() { return sweeper_; }
 
-  // ===========================================================================
-  // Embedder heap tracer support. =============================================
-  // ===========================================================================
-
-  void SetEmbedderHeapTracer(EmbedderHeapTracer* tracer);
-  EmbedderHeapTracer* embedder_heap_tracer() { return embedder_heap_tracer_; }
-  bool UsingEmbedderHeapTracer() { return embedder_heap_tracer(); }
-
-  // In order to avoid running out of memory we force tracing wrappers if there
-  // are too many of them.
-  bool RequiresImmediateWrapperProcessing();
-
-  void RegisterWrappersWithEmbedderHeapTracer();
-
-  void TracePossibleWrapper(JSObject* js_object);
-
-  size_t wrappers_to_trace() { return wrappers_to_trace_.size(); }
-
  private:
   class EvacuateNewSpacePageVisitor;
   class EvacuateNewSpaceVisitor;
@@ -747,12 +729,9 @@ class MarkCompactCollector {
   base::VirtualMemory* marking_deque_memory_;
   size_t marking_deque_memory_committed_;
   MarkingDeque marking_deque_;
-  std::vector<std::pair<void*, void*>> wrappers_to_trace_;
 
   CodeFlusher* code_flusher_;
 
-  EmbedderHeapTracer* embedder_heap_tracer_;
-
   List<Page*> evacuation_candidates_;
   List<Page*> newspace_evacuation_candidates_;