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

chrome/browser/extensions/external_loader.cc

Index: chrome/browser/extensions/external_loader.cc
diff --git a/chrome/browser/extensions/external_loader.cc b/chrome/browser/extensions/external_loader.cc
index 662cdebbd16acdbb7943261e043b127b0443965a..c35316bedc0883c128d0c473a7722792c5b54c0a 100644
--- a/chrome/browser/extensions/external_loader.cc
+++ b/chrome/browser/extensions/external_loader.cc
@@ -45,7 +45,7 @@ void ExternalLoader::LoadFinished() {
 }
 
 void ExternalLoader::OnUpdated(
-    scoped_ptr<base::DictionaryValue> updated_prefs) {
+    std::unique_ptr<base::DictionaryValue> updated_prefs) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (owner_)
     owner_->UpdatePrefs(updated_prefs.release());