Remove JSBuiltinsObject.

src/profiler/heap-snapshot-generator.cc

Index: src/profiler/heap-snapshot-generator.cc
diff --git a/src/profiler/heap-snapshot-generator.cc b/src/profiler/heap-snapshot-generator.cc
index 75de3d6d1ab02563c999a5a3e2c1473cd92d41f5..14257aa22998d69fc922f0f96455071b3aaa2ab6 100644
--- a/src/profiler/heap-snapshot-generator.cc
+++ b/src/profiler/heap-snapshot-generator.cc
@@ -1162,16 +1162,13 @@ void V8HeapExplorer::ExtractJSObjectReferences(
   } else if (obj->IsGlobalObject()) {
     GlobalObject* global_obj = GlobalObject::cast(obj);
     SetInternalReference(global_obj, entry,
-                         "builtins", global_obj->builtins(),
-                         GlobalObject::kBuiltinsOffset);
-    SetInternalReference(global_obj, entry,
                          "native_context", global_obj->native_context(),
                          GlobalObject::kNativeContextOffset);
     SetInternalReference(global_obj, entry,
                          "global_proxy", global_obj->global_proxy(),
                          GlobalObject::kGlobalProxyOffset);
     STATIC_ASSERT(GlobalObject::kHeaderSize - JSObject::kHeaderSize ==
-                 3 * kPointerSize);
+                  2 * kPointerSize);
   } else if (obj->IsJSArrayBufferView()) {
     JSArrayBufferView* view = JSArrayBufferView::cast(obj);
     SetInternalReference(view, entry, "buffer", view->buffer(),