Change more base::ListValue methods to use std::unique_ptr.

base/values.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.
 
 // This file specifies a recursive data storage class called Value intended for
 // storing settings and other persistable data.
 //
 // A Value represents something that can be stored in JSON or passed to/from
 // JavaScript. As such, it is NOT a generalized variant type, since only the
 // types supported by JavaScript/JSON are supported.
@@ skipping 451 matching lines @@
 
   // Convenience forms of Append.
   void AppendBoolean(bool in_value);
   void AppendInteger(int in_value);
   void AppendDouble(double in_value);
   void AppendString(StringPiece in_value);
   void AppendString(const string16& in_value);
   void AppendStrings(const std::vector<std::string>& in_values);
   void AppendStrings(const std::vector<string16>& in_values);
 
-  // Appends a Value if it's not already present. Takes ownership of the
-  // |in_value|. Returns true if successful, or false if the value was already
-  // present. If the value was already present the |in_value| is deleted.
-  bool AppendIfNotPresent(Value* in_value);
+  // Appends a Value if it's not already present. Returns true if successful,
+  // or false if the value was already
+  bool AppendIfNotPresent(std::unique_ptr<Value> in_value);
 
   // Insert a Value at index.
   // Returns true if successful, or false if the index was out of range.
-  bool Insert(size_t index, Value* in_value);
+  bool Insert(size_t index, std::unique_ptr<Value> in_value);
 
   // Searches for the first instance of |value| in the list using the Equals
   // method of the Value type.
   // Returns a const_iterator to the found item or to end() if none exists.
   const_iterator Find(const Value& value) const;
 
   // Swaps contents with the |other| list.
   virtual void Swap(ListValue* other);
 
   // Iteration.
@@ skipping 65 matching lines @@
 }
 
 BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
                                             const ListValue& value) {
   return out << static_cast<const Value&>(value);
 }
 
 }  // namespace base
 
 #endif  // BASE_VALUES_H_