[heap] Remove unused IntrusiveMarking class.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 08282f7f69fb43f59b308b47bceb1ce3e62255d9..5a3db5e9d982996e429f26d082186f4316a3da87 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -113,7 +113,6 @@ Heap::Heap()
       inline_allocation_disabled_(false),
       store_buffer_rebuilder_(store_buffer()),
       hidden_string_(NULL),
-      gc_safe_size_of_old_object_(NULL),
       total_regexp_code_generated_(0),
       tracer_(this),
       high_survival_rate_period_length_(0),
@@ -247,14 +246,6 @@ bool Heap::HasBeenSetUp() {
 }
 
 
-int Heap::GcSafeSizeOfOldObject(HeapObject* object) {
-  if (IntrusiveMarking::IsMarked(object)) {
-    return IntrusiveMarking::SizeOfMarkedObject(object);
-  }
-  return object->SizeFromMap(object->map());
-}
-
-
 GarbageCollector Heap::SelectGarbageCollector(AllocationSpace space,
                                               const char** reason) {
   // Is global GC requested?
@@ -5759,8 +5750,6 @@ bool Heap::SetUp() {
 
   base::CallOnce(&initialize_gc_once, &InitializeGCOnce);
 
-  MarkMapPointersAsEncoded(false);
-
   // Set up memory allocator.
   if (!isolate_->memory_allocator()->SetUp(MaxReserved(), MaxExecutableSize()))
     return false;