Remove JSReceiver::GetPrototype and replace it with PrototypeIterator calls

src/objects.h

 // Copyright 2012 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/builtins.h"
@@ skipping 1971 matching lines @@
       Handle<JSReceiver> object,
       Handle<Name> name);
 
   static inline PropertyAttributes GetElementAttribute(
       Handle<JSReceiver> object,
       uint32_t index);
   static inline PropertyAttributes GetOwnElementAttribute(
       Handle<JSReceiver> object,
       uint32_t index);
 
-  // Return the object's prototype (might be Heap::null_value()).
-  inline Object* GetPrototype() const;
-
   // Return the constructor function (may be Heap::null_value()).
   inline Object* GetConstructor();
 
   // Retrieves a permanent object identity hash code. The undefined value might
   // be returned in case no hash was created yet.
   inline Object* GetIdentityHash();
 
   // Retrieves a permanent object identity hash code. May create and store a
   // hash code if needed and none exists.
   inline static Handle<Smi> GetOrCreateIdentityHash(
@@ skipping 9222 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_