Fix remaining issues in the custom snapshot.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 6aeaff8069ff8d7adc8ebf390447758cbc3aca52..5fc3f07d75f54e406ecaa4ac5171d453b8c14f04 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1486,6 +1486,10 @@ class Heap {
   MUST_USE_RESULT AllocationResult
       AllocateFixedArray(int length, PretenureFlag pretenure = NOT_TENURED);
 
+  static const int kInitialStringTableSize = 2048;
+  static const int kInitialEvalCacheSize = 64;
+  static const int kInitialNumberStringCacheSize = 256;
+
  private:
   Heap();
 
@@ -2043,10 +2047,6 @@ class Heap {
   inline void UpdateAllocationsHash(uint32_t value);
   inline void PrintAlloctionsHash();
 
-  static const int kInitialStringTableSize = 2048;
-  static const int kInitialEvalCacheSize = 64;
-  static const int kInitialNumberStringCacheSize = 256;
-
   // Object counts and used memory by InstanceType
   size_t object_counts_[OBJECT_STATS_COUNT];
   size_t object_counts_last_time_[OBJECT_STATS_COUNT];