When adjusting page's live bytes counter from the mutator adjust owners unswept free bytes counter.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 486be6811da9f18250b087f1608b562dddc6a549..51e172b98a337f6cce426f521802d1385c56962b 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -198,7 +198,7 @@ class MarkingDeque {
     ASSERT(object->IsHeapObject());
     if (IsFull()) {
       Marking::BlackToGrey(object);
-      MemoryChunk::IncrementLiveBytes(object->address(), -object->Size());
+      MemoryChunk::IncrementLiveBytesFromGC(object->address(), -object->Size());
       SetOverflowed();
     } else {
       array_[top_] = object;