[heap] Old generation limit is based on capacity.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 6d30f31c7ca2c09196716cd64ef1b5183035fcc1..02c4678307091c9320b19ad38c499ee0f8eebb5b 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -1138,26 +1138,13 @@ Object* PagedSpace::FindObject(Address addr) {
 }
 
 
-bool PagedSpace::CanExpand(size_t size) {
-  DCHECK(heap()->mark_compact_collector()->is_compacting() ||
-         Capacity() <= heap()->MaxOldGenerationSize());
-
-  // Are we going to exceed capacity for this space? At this point we can be
-  // way over the maximum size because of AlwaysAllocate scopes and large
-  // objects.
-  if (!heap()->CanExpandOldGeneration(static_cast<int>(size))) return false;
-
-  return true;
-}
-
-
 bool PagedSpace::Expand() {
-  intptr_t size = AreaSize();
+  int size = AreaSize();
   if (snapshotable() && !HasPages()) {
     size = Snapshot::SizeOfFirstPage(heap()->isolate(), identity());
   }
 
-  if (!CanExpand(size)) return false;
+  if (!heap()->CanExpandOldGeneration(size)) return false;
 
   Page* p = heap()->isolate()->memory_allocator()->AllocatePage(size, this,
                                                                 executable());