Remove ScopedVector from ios/.

ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc

Index: ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc
diff --git a/ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc b/ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc
index f54f5c881829860eed192cc6d9f6f3851275a3dd..e5adf754964a9f1c5217e070d0cb0e34c21ec07c 100644
--- a/ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc
+++ b/ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.cc
@@ -4,6 +4,7 @@
 
 #include "ios/chrome/browser/ui/webui/sync_internals/sync_internals_ui.h"
 
+#include "base/memory/ptr_util.h"
 #include "components/grit/components_resources.h"
 #include "components/sync/driver/about_sync_util.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
@@ -49,7 +50,7 @@ SyncInternalsUI::SyncInternalsUI(web::WebUIIOS* web_ui)
     : web::WebUIIOSController(web_ui) {
   web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
                                CreateSyncInternalsHTMLSource());
-  web_ui->AddMessageHandler(new SyncInternalsMessageHandler);
+  web_ui->AddMessageHandler(base::MakeUnique<SyncInternalsMessageHandler>());
 }
 
 SyncInternalsUI::~SyncInternalsUI() {}