Remove obsolete GetAccessorPair from ElementsAccessor

src/elements.h

Index: src/elements.h
diff --git a/src/elements.h b/src/elements.h
index 02c15909772fb53fa305b929f477abe7c29eab6d..6fe19559996e695e91c8ba8e8cf38e1f707428c8 100644
--- a/src/elements.h
+++ b/src/elements.h
@@ -54,20 +54,6 @@ class ElementsAccessor {
     return Get(holder, key, handle(holder->elements()));
   }
 
-  // Returns an element's accessors, or NULL if the element does not exist or
-  // is plain. This method doesn't iterate up the prototype chain.  The caller
-  // can optionally pass in the backing store to use for the check, which must
-  // be compatible with the ElementsKind of the ElementsAccessor. If
-  // backing_store is NULL, the holder->elements() is used as the backing store.
-  virtual MaybeHandle<AccessorPair> GetAccessorPair(
-      Handle<JSObject> holder, uint32_t key,
-      Handle<FixedArrayBase> backing_store) = 0;
-
-  inline MaybeHandle<AccessorPair> GetAccessorPair(Handle<JSObject> holder,
-                                                   uint32_t key) {
-    return GetAccessorPair(holder, key, handle(holder->elements()));
-  }
-
   // Modifies the length data property as specified for JSArrays and resizes the
   // underlying backing store accordingly. The method honors the semantics of
   // changing array sizes as defined in EcmaScript 5.1 15.4.5.2, i.e. array that