ScopedVector - fix const semantics.

base/memory/scoped_vector.h

 // Copyright (c) 2012 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 BASE_MEMORY_SCOPED_VECTOR_H_
 #define BASE_MEMORY_SCOPED_VECTOR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 23 matching lines @@
 
   ScopedVector() {}
   ~ScopedVector() { clear(); }
   ScopedVector(RValue other) { swap(*other.object); }
 
   ScopedVector& operator=(RValue rhs) {
     swap(*rhs.object);
     return *this;
   }
 
-  T*& operator[](size_t index) { return v_[index]; }
-  const T* operator[](size_t index) const { return v_[index]; }
+  reference operator[](size_t index) { return v_[index]; }
+  const_reference operator[](size_t index) const { return v_[index]; }
 
   bool empty() const { return v_.empty(); }
   size_t size() const { return v_.size(); }
 
   reverse_iterator rbegin() { return v_.rbegin(); }
   const_reverse_iterator rbegin() const { return v_.rbegin(); }
   reverse_iterator rend() { return v_.rend(); }
   const_reverse_iterator rend() const { return v_.rend(); }
 
   iterator begin() { return v_.begin(); }
@@ skipping 65 matching lines @@
   // Like |erase()|, but doesn't delete the elements in [first, last).
   iterator weak_erase(iterator first, iterator last) {
     return v_.erase(first, last);
   }
 
  private:
   std::vector<T*> v_;
 };
 
 #endif  // BASE_MEMORY_SCOPED_VECTOR_H_