Switch to using scoped_ptr with UserData

content/public/browser/browser_context.h

Index: content/public/browser/browser_context.h
diff --git a/content/public/browser/browser_context.h b/content/public/browser/browser_context.h
index 89461daa21f4788658306876b3e21fd79e7a810f..e400358ddb341c5d8e6a2635fe2c374c29867669 100644
--- a/content/public/browser/browser_context.h
+++ b/content/public/browser/browser_context.h
@@ -144,8 +144,9 @@ class CONTENT_EXPORT BrowserContext : public base::SupportsUserData {
   // across the next restart.
   static void SaveSessionState(BrowserContext* browser_context);
 
-  static void SetDownloadManagerForTesting(BrowserContext* browser_context,
-                                           DownloadManager* download_manager);
+  static void SetDownloadManagerForTesting(
+      BrowserContext* browser_context,
+      std::unique_ptr<content::DownloadManager> download_manager);
 
   // Makes the Service Manager aware of this BrowserContext, and assigns a user
   // ID number to it. Should be called for each BrowserContext created.