Use OnceCallback on Mojo interfaces in //content

content/browser/webui/web_ui_mojo_browsertest.cc

 // Copyright 2014 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 <limits>
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
@@ skipping 67 matching lines @@
 
 class BrowserTargetImpl : public mojom::BrowserTarget {
  public:
   BrowserTargetImpl(base::RunLoop* run_loop,
                     mojo::InterfaceRequest<mojom::BrowserTarget> request)
       : run_loop_(run_loop), binding_(this, std::move(request)) {}
 
   ~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();
   }
 
  protected:
   base::RunLoop* const run_loop_;
 
  private:
   mojo::Binding<mojom::BrowserTarget> binding_;
@@ skipping 133 matching lines @@
   NavigateToURL(other_shell, test_url);
   // RunLoop is quit when message received from page.
   other_run_loop.Run();
   EXPECT_TRUE(g_got_message);
   EXPECT_EQ(shell()->web_contents()->GetRenderProcessHost(),
             other_shell->web_contents()->GetRenderProcessHost());
 }
 
 }  // namespace
 }  // namespace content