Removed IsTransitionType predicate.

src/property.h

Index: src/property.h
diff --git a/src/property.h b/src/property.h
index 120734df9fc4e535b77e7a803700aef253fd7faa..979a5007a8f74a5c3e716d4c9e7bc2c3c631df49 100644
--- a/src/property.h
+++ b/src/property.h
@@ -71,6 +71,8 @@ class Descriptor BASE_EMBEDDED {
     details_ = PropertyDetails(details_.attributes(), details_.type(), index);
   }
 
+  bool ContainsTransition();
+
  private:
   String* key_;
   Object* value_;
@@ -290,7 +292,9 @@ class LookupResult BASE_EMBEDDED {
 
   Map* GetTransitionMap() {
     ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
-    ASSERT(IsTransitionType(type()));
+    ASSERT(type() == MAP_TRANSITION ||
+           type() == ELEMENTS_TRANSITION ||
+           type() == CONSTANT_TRANSITION);
     return Map::cast(GetValue());
   }