Remove obsolete GetAccessorPair from ElementsAccessor

BUG=v8:4137
LOG=n

Review URL: https://codereview.chromium.org/1224533003

Cr-Commit-Position: refs/heads/master@{#29467}

src/elements.cc

@@ -650,19 +650,6 @@ class ElementsAccessorBase : public ElementsAccessor {
     UNREACHABLE();
   }
 
-  virtual MaybeHandle<AccessorPair> GetAccessorPair(
-      Handle<JSObject> holder, uint32_t key,
-      Handle<FixedArrayBase> backing_store) final {
-    return ElementsAccessorSubclass::GetAccessorPairImpl(holder, key,
-                                                         backing_store);
-  }
-
-  static MaybeHandle<AccessorPair> GetAccessorPairImpl(
-      Handle<JSObject> obj, uint32_t key,
-      Handle<FixedArrayBase> backing_store) {
-    return MaybeHandle<AccessorPair>();
-  }
-
   virtual void SetLength(Handle<JSArray> array, uint32_t length) final {
     ElementsAccessorSubclass::SetLengthImpl(array, length,
                                             handle(array->elements()));
@@ -1070,19 +1057,6 @@ class DictionaryElementsAccessor
     object->set_elements(*new_dictionary);
   }
 
-  static MaybeHandle<AccessorPair> GetAccessorPairImpl(
-      Handle<JSObject> obj, uint32_t key, Handle<FixedArrayBase> store) {
-    Handle<SeededNumberDictionary> backing_store =
-        Handle<SeededNumberDictionary>::cast(store);
-    int entry = backing_store->FindEntry(key);
-    if (entry != SeededNumberDictionary::kNotFound &&
-        backing_store->DetailsAt(entry).type() == ACCESSOR_CONSTANT &&
-        backing_store->ValueAt(entry)->IsAccessorPair()) {
-      return handle(AccessorPair::cast(backing_store->ValueAt(entry)));
-    }
-    return MaybeHandle<AccessorPair>();
-  }
-
   static bool HasIndexImpl(FixedArrayBase* store, uint32_t index) {
     DisallowHeapAllocation no_gc;
     SeededNumberDictionary* dict = SeededNumberDictionary::cast(store);
@@ -1572,20 +1546,6 @@ class SloppyArgumentsElementsAccessor
     }
   }
 
-  static MaybeHandle<AccessorPair> GetAccessorPairImpl(
-      Handle<JSObject> obj, uint32_t key, Handle<FixedArrayBase> parameters) {
-    Handle<FixedArray> parameter_map = Handle<FixedArray>::cast(parameters);
-    Handle<Object> probe(GetParameterMapArg(*parameter_map, key),
-                         obj->GetIsolate());
-    if (!probe->IsTheHole()) {
-      return MaybeHandle<AccessorPair>();
-    } else {
-      // If not aliased, check the arguments.
-      Handle<FixedArray> arguments(FixedArray::cast(parameter_map->get(1)));
-      return ArgumentsAccessor::GetAccessorPairImpl(obj, key, arguments);
-    }
-  }
-
   static void SetLengthImpl(Handle<JSArray> array, uint32_t length,
                             Handle<FixedArrayBase> parameter_map) {
     // Sloppy arguments objects are not arrays.

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