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

extensions/renderer/send_request_natives.cc

Index: extensions/renderer/send_request_natives.cc
diff --git a/extensions/renderer/send_request_natives.cc b/extensions/renderer/send_request_natives.cc
index 5824bc0ea2b998445db8c2b3635977dda6ecc8d9..a305b6a94c862011290591209382fd4f0c3b9a61 100644
--- a/extensions/renderer/send_request_natives.cc
+++ b/extensions/renderer/send_request_natives.cc
@@ -13,8 +13,6 @@
 #include "extensions/renderer/request_sender.h"
 #include "extensions/renderer/script_context.h"
 
-using content::V8ValueConverter;
-
 namespace extensions {
 
 SendRequestNatives::SendRequestNatives(RequestSender* request_sender,
@@ -42,7 +40,8 @@ void SendRequestNatives::StartRequest(
   int request_id = request_sender_->GetNextRequestId();
   args.GetReturnValue().Set(static_cast<int32_t>(request_id));
 
-  std::unique_ptr<V8ValueConverter> converter(V8ValueConverter::create());
+  std::unique_ptr<content::V8ValueConverter> converter =
+      content::V8ValueConverter::Create();
 
   // See http://crbug.com/149880. The context menus APIs relies on this, but
   // we shouldn't really be doing it (e.g. for the sake of the storage API).