Changed CloudPrintURLFetcher to be more testable

Made it use CreateURLFetcher with an id rather than without one,
because CreateURLFetcher with an id can be rewired for testing to
use a URLFetcherFactory.

BUG=


Review URL: https://chromiumcodereview.appspot.com/12223056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181577 0039d316-1c4b-4281-b951-d872f2087c98

chrome/service/cloud_print/cloud_print_url_fetcher.cc

@@ -174,7 +174,7 @@ void CloudPrintURLFetcher::StartRequestHelper(
   DCHECK(delegate);
   // Persist the additional headers in case we need to retry the request.
   additional_headers_ = additional_headers;
-  request_.reset(net::URLFetcher::Create(url, request_type, this));
+  request_.reset(net::URLFetcher::Create(0, url, request_type, this));
   request_->SetRequestContext(GetRequestContextGetter());
   // Since we implement our own retry logic, disable the retry in URLFetcher.
   request_->SetAutomaticallyRetryOn5xx(false);