Oilpan: LargeObjectPage::takeSnapshot should not crash

Source/platform/heap/Heap.cpp

Index: Source/platform/heap/Heap.cpp
diff --git a/Source/platform/heap/Heap.cpp b/Source/platform/heap/Heap.cpp
index c1dd9d315b3617088f4cc2d3e1f6b4d9a63d656c..0518d9989f9f59d5a5a7a6d303d48f4b717891cd 100644
--- a/Source/platform/heap/Heap.cpp
+++ b/Source/platform/heap/Heap.cpp
@@ -1709,10 +1709,10 @@ void LargeObjectPage::takeSnapshot(String dumpName, size_t pageIndex)
     HeapObjectHeader* header = heapObjectHeader();
     if (header->isMarked()) {
         liveCount = 1;
-        liveSize += header->size();
+        liveSize += header->payloadSize();
     } else {
         deadCount = 1;
-        deadSize += header->size();
+        deadSize += header->payloadSize();
     }
 
     pageDump->AddScalar("live_count", "objects", liveCount);