BrowserContext should simply own DownloadManager

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index b32b58a2b5634cc44f4d889666613e56bf7b4982..ec029518f1b5e5dffd5696b9bf29a1804640ddc9 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -156,18 +156,18 @@ DownloadManager* BrowserContext::GetDownloadManager(
   if (!context->GetUserData(kDownloadManagerKeyName)) {
     ResourceDispatcherHostImpl* rdh = ResourceDispatcherHostImpl::Get();
     DCHECK(rdh);
-    scoped_refptr<DownloadManager> download_manager =
+    DownloadManager* download_manager =
         new DownloadManagerImpl(
             GetContentClient()->browser()->GetNetLog(), context);
 
     context->SetUserData(
         kDownloadManagerKeyName,
-        new UserDataAdapter<DownloadManager>(download_manager));
+        download_manager);
     download_manager->SetDelegate(context->GetDownloadManagerDelegate());
   }
 
-  return UserDataAdapter<DownloadManager>::Get(
-      context, kDownloadManagerKeyName);
+  return static_cast<DownloadManager*>(
+      context->GetUserData(kDownloadManagerKeyName));
 }
 
 // static