Limit size of first page based on serialized data.

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index 64cce1a97f4d36fe0235b97c30251b67a230819c..28480e649c7cb9e69f4a3800ae39b6cf0aad2bf6 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -2462,12 +2462,11 @@ void SerializedData::AllocateData(int size) {
 }
 
 
-SnapshotData::SnapshotData(const SnapshotByteSink& sink,
-                           const Serializer& ser) {
+SnapshotData::SnapshotData(const Serializer& ser) {
   DisallowHeapAllocation no_gc;
   List<Reservation> reservations;
   ser.EncodeReservations(&reservations);
-  const List<byte>& payload = sink.data();
+  const List<byte>& payload = ser.sink()->data();
 
   // Calculate sizes.
   int reservation_size = reservations.length() * kInt32Size;