Implement Windows GPO support for "dlpref" in component updater.

components/update_client/test_configurator.cc

Index: components/update_client/test_configurator.cc
diff --git a/components/update_client/test_configurator.cc b/components/update_client/test_configurator.cc
index f36ba30fac334943911ae88be7214db15c7e894d..1e4e76ea7def9e06e8e6e9ec71c479b931e40eed 100644
--- a/components/update_client/test_configurator.cc
+++ b/components/update_client/test_configurator.cc
@@ -82,6 +82,10 @@ std::string TestConfigurator::ExtraRequestParams() const {
   return "extra=\"foo\"";
 }
 
+std::string TestConfigurator::GetDownloadPreference() const {
+  return download_preference_;
+}
+
 net::URLRequestContextGetter* TestConfigurator::RequestContext() const {
   return context_.get();
 }
@@ -107,6 +111,11 @@ void TestConfigurator::SetInitialDelay(int seconds) {
   initial_time_ = seconds;
 }
 
+void TestConfigurator::SetDownloadPreference(
+    const std::string& download_preference) {
+  download_preference_ = download_preference;
+}
+
 scoped_refptr<base::SequencedTaskRunner>
 TestConfigurator::GetSequencedTaskRunner() const {
   DCHECK(worker_task_runner_.get());