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

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 #include "chrome/browser/chromeos/login/screens/eula_screen_actor.h"
 #include "chromeos/tpm_password_fetcher.h"
 #include "url/gurl.h"
 
 namespace chromeos {
 
 // Representation independent class that controls OOBE screen showing EULA
 // to users.
 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;
   virtual void Hide() override;
   virtual std::string GetName() const override;
 
   // EulaScreenActor::Delegate implementation:
   virtual GURL GetOemEulaUrl() const override;
   virtual void OnExit(bool accepted, bool usage_stats_enabled) override;
   virtual void InitiatePasswordFetch() override;
   virtual bool IsUsageStatsEnabled() const override;
   virtual void OnActorDestroyed(EulaScreenActor* actor) override;
 
   // TpmPasswordFetcherDelegate implementation:
   virtual void OnPasswordFetched(const std::string& tpm_password) override;
 
  private:
   // URL of the OEM EULA page (on disk).
   GURL oem_eula_page_;
 
   // TPM password local storage. By convention, we clear the password
   // from TPM as soon as we read it. We store it here locally until
   // EULA screen is closed.
   // TODO(glotov): Sanitize memory used to store password when
   // it's destroyed.
   std::string tpm_password_;
 
   EulaScreenActor* actor_;
 
+  Delegate* delegate_;
+
   TpmPasswordFetcher password_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(EulaScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_