Use OnceCallback on Mojo interfaces in //content

content/browser/webui/web_ui_mojo_browsertest.cc

Index: content/browser/webui/web_ui_mojo_browsertest.cc
diff --git a/content/browser/webui/web_ui_mojo_browsertest.cc b/content/browser/webui/web_ui_mojo_browsertest.cc
index 457d8315e888b827121723d288216958e3a627e1..87405d665af35bfb214cfeb4625eb229f1259f8d 100644
--- a/content/browser/webui/web_ui_mojo_browsertest.cc
+++ b/content/browser/webui/web_ui_mojo_browsertest.cc
@@ -85,9 +85,7 @@ class BrowserTargetImpl : public mojom::BrowserTarget {
   ~BrowserTargetImpl() override {}
 
   // mojom::BrowserTarget overrides:
-  void Start(const StartCallback& closure) override {
-    closure.Run();
-  }
+  void Start(StartCallback closure) override { std::move(closure).Run(); }
   void Stop() override {
     g_got_message = true;
     run_loop_->Quit();