Make HeapObjectHeader::checkHeader private.

third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h

Index: third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h b/third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h
index 090fdde39dec71067752c04da5f7e6fa22564296..7a61c175584a7c91cae11de6a20a8d2b11a5160f 100644
--- a/third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h
+++ b/third_party/WebKit/Source/bindings/core/v8/TraceWrapperMember.h
@@ -27,7 +27,8 @@ class TraceWrapperMember : public Member<T> {
   TraceWrapperMember(void* parent, T* raw) : Member<T>(raw), m_parent(parent) {
 #if DCHECK_IS_ON()
     if (m_parent) {
-      HeapObjectHeader::fromPayload(m_parent)->checkHeader();
+      // |fromPayload| checks the integrity of the |HeapObjectHeader|.
+      (void)HeapObjectHeader::fromPayload(m_parent);

[haraken, 2017/03/30 14:12:46]

I'd prefer having HeapObjectHeader::checkHeader() instead of using (void)
though.

     }
 #endif
     // We don't require a write barrier here as TraceWrapperMember is used for