ScopedVector - fix const semantics.

base/memory/scoped_vector.h

Index: base/memory/scoped_vector.h
diff --git a/base/memory/scoped_vector.h b/base/memory/scoped_vector.h
index 90a1f7d7189e1b6472558c77740bd17af168c40c..59144c0e82ac600337f249dc41154a66652de33b 100644
--- a/base/memory/scoped_vector.h
+++ b/base/memory/scoped_vector.h
@@ -41,8 +41,8 @@ class ScopedVector {
     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(); }