Revert of Simplify and compact transitions storage

src/json-parser.h

Index: src/json-parser.h
diff --git a/src/json-parser.h b/src/json-parser.h
index da26670f8e822041921b1bb7bc9f398c99bdaf65..4cf52574b54655a9000651db6391f38bd9cf9450 100644
--- a/src/json-parser.h
+++ b/src/json-parser.h
@@ -359,19 +359,19 @@
         bool follow_expected = false;
         Handle<Map> target;
         if (seq_one_byte) {
-          key = TransitionArray::ExpectedTransitionKey(map);
+          key = Map::ExpectedTransitionKey(map);
           follow_expected = !key.is_null() && ParseJsonString(key);
         }
         // If the expected transition hits, follow it.
         if (follow_expected) {
-          target = TransitionArray::ExpectedTransitionTarget(map);
+          target = Map::ExpectedTransitionTarget(map);
         } else {
           // If the expected transition failed, parse an internalized string and
           // try to find a matching transition.
           key = ParseJsonInternalizedString();
           if (key.is_null()) return ReportUnexpectedCharacter();
 
-          target = TransitionArray::FindTransitionToField(map, key);
+          target = Map::FindTransitionToField(map, key);
           // If a transition was found, follow it and continue.
           transitioning = !target.is_null();
         }