TPH no longer uses V8 heap.

Simple correction over prior commit since TPH no longer needs
to depend on V8 read only heap.

Bug: v8:9533
Change-Id: Icc72cdbb58fb3d9dc79573548cd9fe9cc88b2684
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2039350Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Steve Blackburn <steveblackburn@google.com>
Cr-Commit-Position: refs/heads/master@{#66151}

src/heap/read-only-heap.cc

@@ -144,9 +144,7 @@ bool ReadOnlyHeap::Contains(Address address) {
 // static
 bool ReadOnlyHeap::Contains(HeapObject object) {
   if (V8_ENABLE_THIRD_PARTY_HEAP_BOOL) {
-    // read only includes both TPH and the snapshot, so need both checks
-    return third_party_heap::Heap::InReadOnlySpace(object.address()) ||
-           MemoryChunk::FromHeapObject(object)->InReadOnlySpace();
+    return third_party_heap::Heap::InReadOnlySpace(object.address());
   } else {
     return MemoryChunk::FromHeapObject(object)->InReadOnlySpace();
   }