[Content] Update V8ValueConverter::create to return a std::unique_ptr

content/public/child/v8_value_converter.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 CONTENT_PUBLIC_CHILD_V8_VALUE_CONVERTER_H_
 #define CONTENT_PUBLIC_CHILD_V8_VALUE_CONVERTER_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 54 matching lines @@
     // behavior. This allows to intercept "non-finite" values and do something
     // with them.
     virtual bool FromV8Number(v8::Local<v8::Number> value,
                               std::unique_ptr<base::Value>* out) const;
 
     // If false is returned, V8ValueConverter proceeds with the default
     // behavior.
     virtual bool FromV8Undefined(std::unique_ptr<base::Value>* out) const;
   };
 
-  static V8ValueConverter* create();
+  static std::unique_ptr<V8ValueConverter> Create();
 
   virtual ~V8ValueConverter() {}
 
   // If true, Date objects are converted into DoubleValues with the number of
   // seconds since Unix epoch.
   //
   // Otherwise they are converted into DictionaryValues with whatever additional
   // properties has been set on them.
   virtual void SetDateAllowed(bool val) = 0;
 
@@ skipping 40 matching lines @@
   // converted, whereas if an array throws while converting an item it will be
   // converted to Value(Type::NONE).
   virtual std::unique_ptr<base::Value> FromV8Value(
       v8::Local<v8::Value> value,
       v8::Local<v8::Context> context) const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_CHILD_V8_VALUE_CONVERTER_H_