Convert //content from scoped_ptr to std::unique_ptr

content/public/test/mock_download_manager.cc

Index: content/public/test/mock_download_manager.cc
diff --git a/content/public/test/mock_download_manager.cc b/content/public/test/mock_download_manager.cc
index 073e0864e95a2350928f521da638a034199d5075..8ff5f04b3c5124c9bf4e602317bd9cb05bd1af13 100644
--- a/content/public/test/mock_download_manager.cc
+++ b/content/public/test/mock_download_manager.cc
@@ -87,8 +87,8 @@ MockDownloadManager::MockDownloadManager() {}
 MockDownloadManager::~MockDownloadManager() {}
 
 void MockDownloadManager::StartDownload(
-    scoped_ptr<DownloadCreateInfo> info,
-    scoped_ptr<ByteStreamReader> stream,
+    std::unique_ptr<DownloadCreateInfo> info,
+    std::unique_ptr<ByteStreamReader> stream,
     const DownloadUrlParameters::OnStartedCallback& callback) {
   MockStartDownload(info.get(), stream.get());
 }