Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/ui/webui/net_export/net_export_ui.cc

Index: ios/chrome/browser/ui/webui/net_export/net_export_ui.cc
diff --git a/ios/chrome/browser/ui/webui/net_export/net_export_ui.cc b/ios/chrome/browser/ui/webui/net_export/net_export_ui.cc
index 4c68b8b5b404358f4b60d5c217aab545327af854..6e822b21c3d1cbb078427b57fbbf160c59a1505b 100644
--- a/ios/chrome/browser/ui/webui/net_export/net_export_ui.cc
+++ b/ios/chrome/browser/ui/webui/net_export/net_export_ui.cc
@@ -4,12 +4,12 @@
 
 #include "ios/chrome/browser/ui/webui/net_export/net_export_ui.h"
 
+#include <memory>
 #include <string>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ -226,7 +226,7 @@ void NetExportMessageHandler::SendEmail(const base::FilePath& file_to_send) {
 }
 
 void NetExportMessageHandler::OnExportNetLogInfoChanged(base::Value* arg) {
-  scoped_ptr<base::Value> value(arg);
+  std::unique_ptr<base::Value> value(arg);
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
   web_ui()->CallJavascriptFunction(net_log::kOnExportNetLogInfoChanged, *arg);
 }