-diff --git a/deps/v8/src/heap/incremental-marking.cc b/deps/v8/src/heap/incremental-marking.cc
-index 58eb0aa..b2b796f 100644
---- a/deps/v8/src/heap/incremental-marking.cc
-+++ b/deps/v8/src/heap/incremental-marking.cc
-@@ -364,7 +364,7 @@ void IncrementalMarking::DeactivateIncrementalWriteBarrier() {
- DeactivateIncrementalWriteBarrierForSpace(heap_->new_space());
-
- LargePage* lop = heap_->lo_space()->first_page();
-- while (lop->is_valid()) {
-+ while (LargePage::IsValid(lop)) {
- SetOldSpacePageFlags(lop, false, false);
- lop = lop->next_page();
- }
-@@ -396,7 +396,7 @@ void IncrementalMarking::ActivateIncrementalWriteBarrier() {
- ActivateIncrementalWriteBarrier(heap_->new_space());
-
- LargePage* lop = heap_->lo_space()->first_page();
-- while (lop->is_valid()) {
-+ while (LargePage::IsValid(lop)) {
- SetOldSpacePageFlags(lop, true, is_compacting_);
- lop = lop->next_page();
- }
-diff --git a/deps/v8/src/heap/spaces-inl.h b/deps/v8/src/heap/spaces-inl.h
-index c2c4d12..d63ee63 100644
---- a/deps/v8/src/heap/spaces-inl.h
-+++ b/deps/v8/src/heap/spaces-inl.h
-@@ -155,7 +155,7 @@ Page* Page::Initialize(Heap* heap, MemoryChunk* chunk, Executability executable,
-
- bool PagedSpace::Contains(Address addr) {
- Page* p = Page::FromAddress(addr);
-- if (!p->is_valid()) return false;
-+ if (!Page::IsValid(p)) return false;
- return p->owner() == this;
- }
-
-diff --git a/deps/v8/src/heap/spaces.cc b/deps/v8/src/heap/spaces.cc
-index 0806b25..c0e109b 100644
---- a/deps/v8/src/heap/spaces.cc
-+++ b/deps/v8/src/heap/spaces.cc
-@@ -2953,7 +2953,7 @@ LargePage* LargeObjectSpace::FindPage(Address a) {
- if (e != NULL) {
- DCHECK(e->value != NULL);
- LargePage* page = reinterpret_cast<LargePage*>(e->value);
-- DCHECK(page->is_valid());
-+ DCHECK(LargePage::IsValid(page));
- if (page->Contains(a)) {
- return page;
- }
-diff --git a/deps/v8/src/heap/spaces.h b/deps/v8/src/heap/spaces.h
-index 3461de3..e35c057 100644
---- a/deps/v8/src/heap/spaces.h
-+++ b/deps/v8/src/heap/spaces.h
-@@ -278,9 +278,9 @@ class MemoryChunk {
- // Only works for addresses in pointer spaces, not data or code spaces.
- static inline MemoryChunk* FromAnyPointerAddress(Heap* heap, Address addr);
-
-- Address address() { return reinterpret_cast<Address>(this); }
-+ static bool IsValid(MemoryChunk* chunk) { return chunk != nullptr; }
-
-- bool is_valid() { return address() != NULL; }
-+ Address address() { return reinterpret_cast<Address>(this); }
-
- MemoryChunk* next_chunk() const {
- return reinterpret_cast<MemoryChunk*>(base::Acquire_Load(&next_chunk_));