ScreenObserver::(Set|Get)UsageStatisticsReporting() are extracted into EulaScreen::Delegate.

chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc

Index: chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc
diff --git a/chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc b/chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc
index bbe2a33c91c0125eb7eb9248af977a36da9fb129..e0fd8db09aa0b33e4d74b40e290e96c8748a8653 100644
--- a/chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc
+++ b/chrome/browser/chromeos/login/screens/device_disabled_screen_unittest.cc
@@ -47,8 +47,6 @@ class DeviceDisabledScreenTest : public testing::Test, public ScreenObserver {
   void ShowCurrentScreen() override;
   void OnSetUserNamePassword(const std::string& username,
                              const std::string& password) override;
-  void SetUsageStatisticsReporting(bool val) override;
-  bool GetUsageStatisticsReporting() const override;
   void SetHostConfiguration() override;
   void ConfigureHost(bool accepted_eula,
                      const std::string& lang,
@@ -104,13 +102,6 @@ void DeviceDisabledScreenTest::OnSetUserNamePassword(
     const std::string& password) {
 }
 
-void DeviceDisabledScreenTest::SetUsageStatisticsReporting(bool val) {
-}
-
-bool DeviceDisabledScreenTest::GetUsageStatisticsReporting() const {
-  return false;
-}
-
 void DeviceDisabledScreenTest::SetHostConfiguration() {
 }