Remove more dead code after Object.observe removal

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index b07f3a3ad49335e1dfa0a55000fcad59ad8dcf61..406831d71b424d2407cc9d2abc92ca7e288450c3 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1129,6 +1129,10 @@ class Object {
   MUST_USE_RESULT static MaybeHandle<JSReceiver> ToObject(
       Isolate* isolate, Handle<Object> object, Handle<Context> context);
 
+  // ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
+  MUST_USE_RESULT static MaybeHandle<JSReceiver> ConvertReceiver(
+      Isolate* isolate, Handle<Object> object);
+
   // ES6 section 7.1.14 ToPropertyKey
   MUST_USE_RESULT static inline MaybeHandle<Name> ToName(Isolate* isolate,
                                                          Handle<Object> input);
@@ -1156,6 +1160,10 @@ class Object {
   MUST_USE_RESULT static MaybeHandle<String> ToString(Isolate* isolate,
                                                       Handle<Object> input);
 
+  // ES6 section 7.1.14 ToPropertyKey
+  MUST_USE_RESULT static MaybeHandle<Object> ToPropertyKey(
+      Isolate* isolate, Handle<Object> value);
+
   // ES6 section 7.1.15 ToLength
   MUST_USE_RESULT static MaybeHandle<Object> ToLength(Isolate* isolate,
                                                       Handle<Object> input);
@@ -2178,13 +2186,6 @@ class JSObject: public JSReceiver {
   MUST_USE_RESULT static Maybe<PropertyAttributes>
       GetPropertyAttributesWithFailedAccessCheck(LookupIterator* it);
 
-  // Retrieves an AccessorPair property from the given object. Might return
-  // undefined if the property doesn't exist or is of a different kind.
-  MUST_USE_RESULT static MaybeHandle<Object> GetAccessor(
-      Handle<JSObject> object,
-      Handle<Name> name,
-      AccessorComponent component);
-
   // Defines an AccessorPair property on the given object.
   // TODO(mstarzinger): Rename to SetAccessor().
   static MaybeHandle<Object> DefineAccessor(Handle<JSObject> object,
@@ -2298,15 +2299,6 @@ class JSObject: public JSReceiver {
   void CollectOwnPropertyNames(KeyAccumulator* keys,
                                PropertyFilter filter = ALL_PROPERTIES);
 
-  // Returns the number of properties on this object filtering out properties
-  // with the specified attributes (ignoring interceptors).
-  // TODO(jkummerow): Deprecated, only used by Object.observe.
-  int NumberOfOwnElements(PropertyFilter filter);
-  // Returns the number of elements on this object filtering out elements
-  // with the specified attributes (ignoring interceptors).
-  // TODO(jkummerow): Deprecated, only used by Object.observe.
-  int GetOwnElementKeys(FixedArray* storage, PropertyFilter filter);
-
   static void CollectOwnElementKeys(Handle<JSObject> object,
                                     KeyAccumulator* keys,
                                     PropertyFilter filter);
@@ -3489,22 +3481,15 @@ class Dictionary: public HashTable<Derived, Shape, Key> {
 
   // Returns the number of elements in the dictionary filtering out properties
   // with the specified attributes.
-  // TODO(jkummerow): Deprecated, only used by Object.observe.
   int NumberOfElementsFilterAttributes(PropertyFilter filter);
 
   // Returns the number of enumerable elements in the dictionary.
-  // TODO(jkummerow): Deprecated, only used by Object.observe.
   int NumberOfEnumElements() {
     return NumberOfElementsFilterAttributes(ENUMERABLE_STRINGS);
   }
 
   enum SortMode { UNSORTED, SORTED };
 
-  // Fill in details for properties into storage.
-  // Returns the number of properties added.
-  // TODO(jkummerow): Deprecated, only used by Object.observe.
-  int CopyKeysTo(FixedArray* storage, int index, PropertyFilter filter,
-                 SortMode sort_mode);
   // Collect the keys into the given KeyAccumulator, in ascending chronological
   // order of property creation.
   static void CollectKeysTo(Handle<Dictionary<Derived, Shape, Key> > dictionary,