Fix |Array| and iterator_util.h's Iterator operator->() behavior

mojo/public/cpp/bindings/array.h

 // Copyright 2013 The Chromium 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 MOJO_PUBLIC_CPP_BINDINGS_ARRAY_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_ARRAY_H_
 
 #include <string.h>
 
 #include <algorithm>
@@ skipping 179 matching lines @@
     Iterator operator--(int) {
       Iterator original = *this;
       --pos_;
       return original;
     }
     bool operator==(const Iterator& o) const {
       return o.arr_ == arr_ && o.pos_ == pos_;
     }
     bool operator!=(const Iterator& o) const { return !(*this == o); }
     RefType operator*() const { return arr_->at(pos_); }
-    RefType operator->() const { return operator*(); }
+    T* operator->() const { return &arr_->at(pos_); }
 
     // The following satisfy RandomAccessIterator:
     Iterator& operator+=(difference_type dist) {
       pos_ += dist;
       return *this;
     }
     Iterator& operator-=(difference_type dist) {
       pos_ -= dist;
       return *this;
     }
@@ skipping 92 matching lines @@
       for (size_t i = 0; i < input.size(); ++i)
         result.insert(TypeConverter<E, T>::Convert(input[i]));
     }
     return result;
   }
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ARRAY_H_