[cleanup] Remove unused function and fix typo in comment.

R=sigurds@chromium.org

Bug: v8:7902
Change-Id: I0a126221ffded34cccc7db793e92d0ae22952bb4
Reviewed-on: https://chromium-review.googlesource.com/1118235Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54088}

src/objects.cc

@@ -4610,7 +4610,7 @@ void Map::GeneralizeField(Isolate* isolate, Handle<Map> map, int modify_index,
   Handle<FieldType> old_field_type(old_descriptors->GetFieldType(modify_index),
                                    isolate);
 
-  // Return if the current map is general enough to hold requested contness and
+  // Return if the current map is general enough to hold requested constness and
   // representation/field type.
   if (((FLAG_modify_map_inplace &&
         IsGeneralizableTo(new_constness, old_constness)) ||
@@ -14858,17 +14858,6 @@ void JSArray::SetLength(Handle<JSArray> array, uint32_t new_length) {
 }
 
 
-// static
-void Map::AddDependentCode(Isolate* isolate, Handle<Map> map,
-                           DependentCode::DependencyGroup group,
-                           Handle<Code> code) {
-  Handle<WeakCell> cell = Code::WeakCellFor(code);
-  Handle<DependentCode> codes = DependentCode::InsertWeakCode(
-      Handle<DependentCode>(map->dependent_code(), isolate), group, cell);
-  if (*codes != map->dependent_code()) map->set_dependent_code(*codes);
-}
-
-
 Handle<DependentCode> DependentCode::InsertCompilationDependencies(
     Handle<DependentCode> entries, DependencyGroup group,
     Handle<Foreign> info) {

src/objects/map.h

@@ -773,15 +773,9 @@ class Map : public HeapObject {
   inline bool IsJSGlobalObjectMap() const;
   inline bool IsJSTypedArrayMap() const;
   inline bool IsJSDataViewMap() const;
-
   inline bool IsSpecialReceiverMap() const;
-
   inline bool IsCustomElementsReceiverMap() const;
 
-  static void AddDependentCode(Isolate* isolate, Handle<Map> map,
-                               DependentCode::DependencyGroup group,
-                               Handle<Code> code);
-
   bool IsMapInArrayPrototypeChain(Isolate* isolate) const;
 
   static Handle<WeakCell> WeakCellForMap(Isolate* isolate, Handle<Map> map);