Convert //content from scoped_ptr to std::unique_ptr

content/public/browser/download_url_parameters.cc

Index: content/public/browser/download_url_parameters.cc
diff --git a/content/public/browser/download_url_parameters.cc b/content/public/browser/download_url_parameters.cc
index 498ae3d67ec62da5921ae97dc63141fb62784839..a17be5a06d48f647bccd7facd6bd37001a7a39c5 100644
--- a/content/public/browser/download_url_parameters.cc
+++ b/content/public/browser/download_url_parameters.cc
@@ -37,10 +37,10 @@ DownloadUrlParameters::~DownloadUrlParameters() {
 }
 
 // static
-scoped_ptr<DownloadUrlParameters> DownloadUrlParameters::FromWebContents(
+std::unique_ptr<DownloadUrlParameters> DownloadUrlParameters::FromWebContents(
     WebContents* web_contents,
     const GURL& url) {
-  return scoped_ptr<DownloadUrlParameters>(new DownloadUrlParameters(
+  return std::unique_ptr<DownloadUrlParameters>(new DownloadUrlParameters(
       url, web_contents->GetRenderProcessHost()->GetID(),
       web_contents->GetRenderViewHost()->GetRoutingID(),
       web_contents->GetMainFrame()->GetRoutingID(),