Remove JSReceiver::GetPrototype and replace it with PrototypeIterator calls

src/prototype.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_PROTOTYPE_H_
 #define V8_PROTOTYPE_H_
 
 #include "src/isolate.h"
 #include "src/objects.h"
 
@@ skipping 34 matching lines @@
         object_(receiver),
         isolate_(isolate) {
     if (where_to_start == START_AT_PROTOTYPE) {
       Advance();
     }
   }
   explicit PrototypeIterator(Map* receiver_map)
       : did_jump_to_prototype_chain_(true),
         object_(receiver_map->prototype()),
         isolate_(receiver_map->GetIsolate()) {}
+  explicit PrototypeIterator(Handle<Map> receiver_map)
+      : did_jump_to_prototype_chain_(true),
+        object_(NULL),
+        handle_(handle(receiver_map->prototype(), receiver_map->GetIsolate())),
+        isolate_(receiver_map->GetIsolate()) {}
   ~PrototypeIterator() {}
 
   Object* GetCurrent() const {
     ASSERT(handle_.is_null());
     return object_;
   }
   static Handle<Object> GetCurrent(const PrototypeIterator& iterator) {
     ASSERT(!iterator.handle_.is_null());
     return iterator.handle_;
   }
@@ skipping 56 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrototypeIterator);
 };
 
 
 }  // namespace internal
 
 }  // namespace v8
 
 #endif  // V8_PROTOTYPE_H_