[heap] Make the Marking class all static.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1408 matching lines @@
   double get_min_in_mutator() { return min_in_mutator_; }
 
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
   MarkCompactCollector* mark_compact_collector() {
     return &mark_compact_collector_;
   }
 
   StoreBuffer* store_buffer() { return &store_buffer_; }
 
-  Marking* marking() { return &marking_; }
-
   IncrementalMarking* incremental_marking() { return &incremental_marking_; }
 
   ExternalStringTable* external_string_table() {
     return &external_string_table_;
   }
 
   // Returns the current sweep generation.
   int sweep_generation() { return sweep_generation_; }
 
   bool concurrent_sweeping_enabled() { return concurrent_sweeping_enabled_; }
@@ skipping 852 matching lines @@
   // Last time an idle notification happened.
   double last_idle_notification_time_;
 
   // Last time a garbage collection happened.
   double last_gc_time_;
 
   MarkCompactCollector mark_compact_collector_;
 
   StoreBuffer store_buffer_;
 
-  Marking marking_;
-
   IncrementalMarking incremental_marking_;
 
   GCIdleTimeHandler gc_idle_time_handler_;
 
   MemoryReducer memory_reducer_;
 
   // These two counters are monotomically increasing and never reset.
   size_t full_codegen_bytes_generated_;
   size_t crankshaft_codegen_bytes_generated_;
 
@@ skipping 528 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_