Revert of Internalize strings in-place

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 53a1310ed9ca4a210988166a1b94f962a7ba99e1..d86406bf5f77c204957dce60d4125974eff17f0e 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -31,10 +31,6 @@ void StaticNewSpaceVisitor<StaticVisitor>::Initialize() {
       kVisitConsString,
       &FixedBodyVisitor<StaticVisitor, ConsString::BodyDescriptor, int>::Visit);
 
-  table_.Register(
-      kVisitThinString,
-      &FixedBodyVisitor<StaticVisitor, ThinString::BodyDescriptor, int>::Visit);
-
   table_.Register(kVisitSlicedString,
                   &FixedBodyVisitor<StaticVisitor, SlicedString::BodyDescriptor,
                                     int>::Visit);
@@ -121,10 +117,6 @@ void StaticMarkingVisitor<StaticVisitor>::Initialize() {
                   &FixedBodyVisitor<StaticVisitor, ConsString::BodyDescriptor,
                                     void>::Visit);
 
-  table_.Register(kVisitThinString,
-                  &FixedBodyVisitor<StaticVisitor, ThinString::BodyDescriptor,
-                                    void>::Visit);
-
   table_.Register(kVisitSlicedString,
                   &FixedBodyVisitor<StaticVisitor, SlicedString::BodyDescriptor,
                                     void>::Visit);