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

chrome/browser/extensions/install_signer.cc

Index: chrome/browser/extensions/install_signer.cc
diff --git a/chrome/browser/extensions/install_signer.cc b/chrome/browser/extensions/install_signer.cc
index 7ddaa62aee8e330a66247daa28e0fcae7172b784..1fca16acc3b0ef475fef17f3d2e9e5f7b57f15fc 100644
--- a/chrome/browser/extensions/install_signer.cc
+++ b/chrome/browser/extensions/install_signer.cc
@@ -369,8 +369,8 @@ void InstallSigner::GetSignature(const SignatureCallback& callback) {
                                      base::Unretained(this));
 
   delegate_.reset(new FetcherDelegate(closure));
-  url_fetcher_.reset(net::URLFetcher::Create(
-      GetBackendUrl(), net::URLFetcher::POST, delegate_.get()));
+  url_fetcher_ = net::URLFetcher::Create(GetBackendUrl(), net::URLFetcher::POST,
+                                         delegate_.get());
   url_fetcher_->SetRequestContext(context_getter_);
 
   // The request protocol is JSON of the form: