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 3805085e70dfd50c879e2ff6ed518546f7b87991..0148a29a319dee305d82a86492b04d717325e7d1 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -101,6 +101,8 @@ 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)                               \
@@ -2135,10 +2137,6 @@ 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; }