Revert of [ic] Use validity cells to protect keyed element stores against object's prototype chain…

src/factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/globals.h"
 #include "src/isolate.h"
 #include "src/messages.h"
@@ skipping 67 matching lines @@
   // Create a new PromiseResolveThenableJobInfo struct.
   Handle<PromiseResolveThenableJobInfo> NewPromiseResolveThenableJobInfo(
       Handle<JSReceiver> thenable, Handle<JSReceiver> then,
       Handle<JSFunction> resolve, Handle<JSFunction> reject,
       Handle<Object> debug_id, Handle<Object> debug_name,
       Handle<Context> context);
 
   // Create a new PrototypeInfo struct.
   Handle<PrototypeInfo> NewPrototypeInfo();
 
-  // Create a new Tuple2 struct.
-  Handle<Tuple2> NewTuple2(Handle<Object> value1, Handle<Object> value2);
-
   // Create a new Tuple3 struct.
   Handle<Tuple3> NewTuple3(Handle<Object> value1, Handle<Object> value2,
                            Handle<Object> value3);
 
   // Create a new ContextExtension struct.
   Handle<ContextExtension> NewContextExtension(Handle<ScopeInfo> scope_info,
                                                Handle<Object> extension);
 
   // Create a pre-tenured empty AccessorPair.
   Handle<AccessorPair> NewAccessorPair();
@@ skipping 698 matching lines @@
                                      FunctionMode function_mode);
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_