Internalize strings in-place

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index f987aaab9b606cbf818d5d4d2fca7f8ae803b4a7..2111f2655176edc3f5ccbcc19f4e5cd4fbece1a7 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -98,6 +98,8 @@ using v8::MemoryPressureLevel;
   V(Map, string_map, StringMap)                                                \
   V(Map, cons_one_byte_string_map, ConsOneByteStringMap)                       \
   V(Map, cons_string_map, ConsStringMap)                                       \
+  V(Map, thin_one_byte_string_map, ThinOneByteStringMap)                       \
+  V(Map, thin_string_map, ThinStringMap)                                       \
   V(Map, sliced_string_map, SlicedStringMap)                                   \
   V(Map, sliced_one_byte_string_map, SlicedOneByteStringMap)                   \
   V(Map, external_string_map, ExternalStringMap)                               \
@@ -2116,10 +2118,6 @@ class Heap {
   MUST_USE_RESULT AllocationResult
       AllocateCode(int object_size, bool immovable);
 
-  MUST_USE_RESULT AllocationResult InternalizeStringWithKey(HashTableKey* key);
-
-  MUST_USE_RESULT AllocationResult InternalizeString(String* str);
-
   // ===========================================================================
 
   void set_force_oom(bool value) { force_oom_ = value; }