Embed entries_ list into HeapObjectsMap by value.

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 71167f735810749ac8da45bed21b28e8a0fed53a..897962e8c6162db20f44bb8f5052a833992dd853 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -705,7 +705,6 @@ class HeapSnapshot {
 class HeapObjectsMap {
  public:
   HeapObjectsMap();
-  ~HeapObjectsMap();
 
   void SnapshotGenerationFinished();
   SnapshotObjectId FindEntry(Address addr);
@@ -761,7 +760,7 @@ class HeapObjectsMap {
 
   SnapshotObjectId next_id_;
   HashMap entries_map_;
-  List<EntryInfo>* entries_;
+  List<EntryInfo> entries_;
   List<TimeInterval> time_intervals_;
 
   DISALLOW_COPY_AND_ASSIGN(HeapObjectsMap);