Revert of Introduce instance type for transition arrays.

src/transitions.h

Index: src/transitions.h
diff --git a/src/transitions.h b/src/transitions.h
index deda90ad6030786964d2753523b5351a24368df0..4cac2ff3da79a1618704e3ca90228ca59aa70582 100644
--- a/src/transitions.h
+++ b/src/transitions.h
@@ -165,11 +165,8 @@
 
   static int Capacity(Object* raw_transitions);
 
-  inline static TransitionArray* cast(Object* object);
-
-  // This field should be used only by GC.
-  inline void set_next_link(Object* next, WriteBarrierMode mode);
-  inline Object* next_link();
+  // Casting.
+  static inline TransitionArray* cast(Object* obj);
 
   static const int kTransitionSize = 2;
   static const int kProtoTransitionHeaderSize = 1;
@@ -183,14 +180,6 @@
                                bool print_header = true);  // NOLINT
 #endif
 
-#ifdef OBJECT_PRINT
-  void TransitionArrayPrint(std::ostream& os);  // NOLINT
-#endif
-
-#ifdef VERIFY_HEAP
-  void TransitionArrayVerify();
-#endif
-
 #ifdef DEBUG
   bool IsSortedNoDuplicates(int valid_entries = -1);
   static bool IsSortedNoDuplicates(Map* map);
@@ -210,10 +199,9 @@
 
  private:
   // Layout for full transition arrays.
-  static const int kNextLinkIndex = 0;
-  static const int kPrototypeTransitionsIndex = 1;
-  static const int kTransitionLengthIndex = 2;
-  static const int kFirstIndex = 3;
+  static const int kPrototypeTransitionsIndex = 0;
+  static const int kTransitionLengthIndex = 1;
+  static const int kFirstIndex = 2;
 
   // Layout of map transition entries in full transition arrays.
   static const int kTransitionKey = 0;
@@ -316,7 +304,6 @@
                                                TransitionArray* old_transitions,
                                                Object* transitions);
 #endif
-  static void ZapTransitionArray(TransitionArray* transitions);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray);
 };