Adjust URLFetcher::Create API so that object is returned as scoped_ptr.

extensions/browser/content_hash_fetcher.cc

Index: extensions/browser/content_hash_fetcher.cc
diff --git a/extensions/browser/content_hash_fetcher.cc b/extensions/browser/content_hash_fetcher.cc
index e4190be3b533cf7e167f090399aa2896055972f4..eefc99145a31d5939b5ca170ce1d4ceb897d5044 100644
--- a/extensions/browser/content_hash_fetcher.cc
+++ b/extensions/browser/content_hash_fetcher.cc
@@ -237,8 +237,8 @@ void ContentHashFetcherJob::DoneCheckingForVerifiedContents(bool found) {
   } else {
     VLOG(1) << "Missing verified contents for " << extension_id_
             << ", fetching...";
-    url_fetcher_.reset(
-        net::URLFetcher::Create(fetch_url_, net::URLFetcher::GET, this));
+    url_fetcher_ =
+        net::URLFetcher::Create(fetch_url_, net::URLFetcher::GET, this);
     url_fetcher_->SetRequestContext(request_context_);
     url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                                net::LOAD_DO_NOT_SAVE_COOKIES |