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

chrome/browser/chromeos/extensions/wallpaper_api.cc

Index: chrome/browser/chromeos/extensions/wallpaper_api.cc
diff --git a/chrome/browser/chromeos/extensions/wallpaper_api.cc b/chrome/browser/chromeos/extensions/wallpaper_api.cc
index b57296cbe9e9082720133a02556926acabcec265..2ae5cc168247516db2af51a6c6828e18f8d97b27 100644
--- a/chrome/browser/chromeos/extensions/wallpaper_api.cc
+++ b/chrome/browser/chromeos/extensions/wallpaper_api.cc
@@ -48,9 +48,7 @@ class WallpaperFetcher : public net::URLFetcherDelegate {
   void FetchWallpaper(const GURL& url, FetchCallback callback) {
     CancelPreviousFetch();
     callback_ = callback;
-    url_fetcher_.reset(net::URLFetcher::Create(url,
-                                               net::URLFetcher::GET,
-                                               this));
+    url_fetcher_ = net::URLFetcher::Create(url, net::URLFetcher::GET, this);
     url_fetcher_->SetRequestContext(
         g_browser_process->system_request_context());
     url_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE);