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

chrome/browser/extensions/blacklist_state_fetcher.cc

Index: chrome/browser/extensions/blacklist_state_fetcher.cc
diff --git a/chrome/browser/extensions/blacklist_state_fetcher.cc b/chrome/browser/extensions/blacklist_state_fetcher.cc
index c92279d6a9142ad31538a3dad11601543d93f337..1c904103a79565a4facb30f32c1838ccaadeffcd 100644
--- a/chrome/browser/extensions/blacklist_state_fetcher.cc
+++ b/chrome/browser/extensions/blacklist_state_fetcher.cc
@@ -115,7 +115,7 @@ void BlacklistStateFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
     return;
   }
 
-  scoped_ptr<const net::URLFetcher> fetcher;
+  std::unique_ptr<const net::URLFetcher> fetcher;
 
   fetcher.reset(it->first);
   std::string id = it->second;