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

chrome/browser/chromeos/login/screens/eula_screen.h

Index: chrome/browser/chromeos/login/screens/eula_screen.h
diff --git a/chrome/browser/chromeos/login/screens/eula_screen.h b/chrome/browser/chromeos/login/screens/eula_screen.h
index d5afbbd676655eebb3fa0c0b09e3ad2e2574f4fb..15fc4d2ab99dbfc94fe84b67996ed6e61ac40e7a 100644
--- a/chrome/browser/chromeos/login/screens/eula_screen.h
+++ b/chrome/browser/chromeos/login/screens/eula_screen.h
@@ -21,9 +21,20 @@ class EulaScreen : public BaseScreen,
                    public EulaScreenActor::Delegate,
                    public TpmPasswordFetcherDelegate {
  public:
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    // Whether usage statistics reporting is enabled on EULA screen.
+    virtual void SetUsageStatisticsReporting(bool val) = 0;
+    virtual bool GetUsageStatisticsReporting() const = 0;
+  };
+
   EulaScreen(ScreenObserver* observer, EulaScreenActor* actor);
   virtual ~EulaScreen();
 
+  void SetDelegate(Delegate* delegate);
+
   // BaseScreen implementation:
   virtual void PrepareToShow() override;
   virtual void Show() override;
@@ -53,6 +64,8 @@ class EulaScreen : public BaseScreen,
 
   EulaScreenActor* actor_;
 
+  Delegate* delegate_;
+
   TpmPasswordFetcher password_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(EulaScreen);