Convert //extensions/browser/api from scoped_ptr to std::unique_ptr

extensions/browser/api/webcam_private/visca_webcam.cc

 // Copyright 2015 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 "extensions/browser/api/webcam_private/visca_webcam.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 471 matching lines @@
                     weak_ptr_factory_.GetWeakPtr(), callback));
   }
   if (zoom) {
     // Set the default zoom value to 100 to be consistent with V4l2 webcam.
     const int kDefaultZoom = 100;
     SetZoom(kDefaultZoom, callback);
   }
 }
 
 void ViscaWebcam::OpenForTesting(
-    scoped_ptr<SerialConnection> serial_connection) {
+    std::unique_ptr<SerialConnection> serial_connection) {
   serial_connection_ = std::move(serial_connection);
 }
 
 SerialConnection* ViscaWebcam::GetSerialConnectionForTesting() {
   return serial_connection_.get();
 }
 
 }  // namespace extensions