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

components/captive_portal/captive_portal_detector.cc

Index: components/captive_portal/captive_portal_detector.cc
diff --git a/components/captive_portal/captive_portal_detector.cc b/components/captive_portal/captive_portal_detector.cc
index b7b8668e5fa639615e6450d8520aef9a7d0d8ae9..ceeffe6b728c004d8e2fe50054de01d83bb80b7e 100644
--- a/components/captive_portal/captive_portal_detector.cc
+++ b/components/captive_portal/captive_portal_detector.cc
@@ -34,10 +34,7 @@ void CaptivePortalDetector::DetectCaptivePortal(
   detection_callback_ = detection_callback;
 
   // The first 0 means this can use a TestURLFetcherFactory in unit tests.
-  url_fetcher_.reset(net::URLFetcher::Create(0,
-                                             url,
-                                             net::URLFetcher::GET,
-                                             this));
+  url_fetcher_ = net::URLFetcher::Create(0, url, net::URLFetcher::GET, this);
   url_fetcher_->SetAutomaticallyRetryOn5xx(false);
   url_fetcher_->SetRequestContext(request_context_.get());