Switch UnreachableObjectsFilter to use Marking instead of InstrusiveMarking.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index ee16ec42864a8f1b1ee042ea32c672b1959d8c1f..dd455e74ae3879325db7f6d3ac1e3f6243fe8362 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -889,7 +889,7 @@ bool String::MakeExternal(v8::String::ExternalStringResource* resource) {
   // Fill the remainder of the string with dead wood.
   int new_size = this->Size();  // Byte size of the external String object.
   heap->CreateFillerObjectAt(this->address() + new_size, size - new_size);
-  if (Marking::IsBlack(Marking::MarkBitFrom(this))) {
+  if (MarkCompactCollector::IsLiveBytesUpdateRequired(this)) {
     MemoryChunk::IncrementLiveBytes(this->address(), new_size - size);
   }
   return true;
@@ -938,7 +938,7 @@ bool String::MakeExternal(v8::String::ExternalAsciiStringResource* resource) {
   // Fill the remainder of the string with dead wood.
   int new_size = this->Size();  // Byte size of the external String object.
   heap->CreateFillerObjectAt(this->address() + new_size, size - new_size);
-  if (Marking::IsBlack(Marking::MarkBitFrom(this))) {
+  if (MarkCompactCollector::IsLiveBytesUpdateRequired(this)) {
     MemoryChunk::IncrementLiveBytes(this->address(), new_size - size);
   }
 
@@ -3255,7 +3255,7 @@ MaybeObject* JSObject::NormalizeProperties(PropertyNormalizationMode mode,
   ASSERT(instance_size_delta >= 0);
   current_heap->CreateFillerObjectAt(this->address() + new_instance_size,
                                      instance_size_delta);
-  if (Marking::IsBlack(Marking::MarkBitFrom(this))) {
+  if (MarkCompactCollector::IsLiveBytesUpdateRequired(this)) {
     MemoryChunk::IncrementLiveBytes(this->address(), -instance_size_delta);
   }