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

components/plugins/renderer/loadable_plugin_placeholder.cc

 // Copyright 2015 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 "components/plugins/renderer/loadable_plugin_placeholder.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 325 matching lines @@
 
 void LoadablePluginPlaceholder::DidFinishIconRepositionForTestingCallback() {
   if (!plugin())
     return;
 
   // Set an attribute and post an event, so browser tests can wait for the
   // placeholder to be ready to receive simulated user input.
   blink::WebElement element = plugin()->Container()->GetElement();
   element.SetAttribute("placeholderReady", "true");
 
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
   base::Value value("placeholderReady");
   blink::WebSerializedScriptValue message_data =
       blink::WebSerializedScriptValue::Serialize(
           blink::MainThreadIsolate(),
-          converter->ToV8Value(
+          content::V8ValueConverter::Create()->ToV8Value(
               &value,
               element.GetDocument().GetFrame()->MainWorldScriptContext()));
   blink::WebDOMMessageEvent msg_event(message_data);
 
   plugin()->Container()->EnqueueMessageEvent(msg_event);
 }
 
 void LoadablePluginPlaceholder::SetPluginInfo(
     const content::WebPluginInfo& plugin_info) {
   plugin_info_ = plugin_info;
@@ skipping 11 matching lines @@
   return identifier_;
 }
 
 bool LoadablePluginPlaceholder::LoadingBlocked() const {
   DCHECK(allow_loading_);
   return is_blocked_for_tinyness_ || is_blocked_for_background_tab_ ||
          is_blocked_for_power_saver_poster_ || is_blocked_for_prerendering_;
 }
 
 }  // namespace plugins