Change base::Value::ListStorage to std::vector<base::Value>

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 31 matching lines @@
 class Value;
 
 // The Value class is the base class for Values. A Value can be instantiated
 // via the Create*Value() factory methods, or by directly creating instances of
 // the subclasses.
 //
 // See the file-level comment above for more information.
 class BASE_EXPORT Value {
  public:
   using DictStorage = base::flat_map<std::string, std::unique_ptr<Value>>;
-  using ListStorage = std::vector<std::unique_ptr<Value>>;
+  using ListStorage = std::vector<Value>;
 
   enum class Type {
     NONE = 0,
     BOOLEAN,
     INTEGER,
     DOUBLE,
     STRING,
     BINARY,
     DICTIONARY,
     LIST
@@ skipping 320 matching lines @@
   static std::unique_ptr<ListValue> From(std::unique_ptr<Value> value);
 
   ListValue();
 
   // Clears the contents of this ListValue
   void Clear();
 
   // Returns the number of Values in this list.
   size_t GetSize() const { return list_->size(); }
 
+  // Returns the capacity of storage for Values in this list.
+  size_t capacity() const { return list_->capacity(); }
+
   // Returns whether the list is empty.
   bool empty() const { return list_->empty(); }
 
+  // Reserves storage for at least |n| values.
+  void Reserve(size_t n);
+
   // Sets the list item at the given index to be the Value specified by
   // the value given.  If the index beyond the current end of the list, null
   // Values will be used to pad out the list.
   // Returns true if successful, or false if the index was negative or
   // the value is a null pointer.
   bool Set(size_t index, Value* in_value);
   // Preferred version of the above. TODO(estade): remove the above.
   bool Set(size_t index, std::unique_ptr<Value> in_value);
 
   // Gets the Value at the given index.  Modifies |out_value| (and returns true)
@@ skipping 126 matching lines @@
   return out << static_cast<const Value&>(value);
 }
 
 // Stream operator so that enum class Types can be used in log statements.
 BASE_EXPORT std::ostream& operator<<(std::ostream& out,
                                      const Value::Type& type);
 
 }  // namespace base
 
 #endif  // BASE_VALUES_H_