Use std::unique_ptr<base::Value> in V8ValueConverter.

content/renderer/web_ui_extension.cc

 // Copyright 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.
 
 #include "content/renderer/web_ui_extension.h"
 
 #include <memory>
+#include <utility>
 
 #include "base/values.h"
 #include "content/common/view_messages.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/common/bindings_policy.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/renderer/chrome_object_extensions_utils.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "content/renderer/web_ui_extension_data.h"
@@ skipping 83 matching lines @@
   if (args->PeekNext().IsEmpty() || args->PeekNext()->IsUndefined()) {
     content.reset(new base::ListValue());
   } else {
     v8::Local<v8::Object> obj;
     if (!args->GetNext(&obj)) {
       args->ThrowError();
       return;
     }
 
     std::unique_ptr<V8ValueConverter> converter(V8ValueConverter::create());
-
-    base::Value* value =
-        converter->FromV8Value(obj, frame->mainWorldScriptContext());
-    base::ListValue* list = NULL;
-    value->GetAsList(&list);
-    DCHECK(list);
-    content.reset(list);
+    content = base::ListValue::From(
+        converter->FromV8Value(obj, frame->mainWorldScriptContext()));
+    DCHECK(content);
   }
 
   // Send the message up to the browser.
   render_view->Send(new ViewHostMsg_WebUISend(render_view->GetRoutingID(),
                                               frame->document().url(),
                                               message,
                                               *content));
 }
 
 // static
 std::string WebUIExtension::GetVariableValue(const std::string& name) {
   blink::WebFrame* frame;
   RenderView* render_view;
   if (!ShouldRespondToRequest(&frame, &render_view))
     return std::string();
 
   return WebUIExtensionData::Get(render_view)->GetValue(name);
 }
 
 }  // namespace content