Allow self_size to be larger than 2GB in heap snapshots.

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index 46752e968dcf1ad4c487d4246ebd385f91255539..59c2d5dacdb13eb390cd6e266957398336a5d553 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -257,7 +257,11 @@ class V8_EXPORT HeapGraphNode {
   SnapshotObjectId GetId() const;
 
   /** Returns node's own size, in bytes. */
-  int GetSelfSize() const;
+  V8_DEPRECATED("Use GetShallowSize instead",
+                int GetSelfSize() const);
+
+  /** Returns node's own size, in bytes. */
+  size_t GetShallowSize() const;
 
   /** Returns child nodes count of the node. */
   int GetChildrenCount() const;