Introduce SigninManagerDelegate and use to eliminate CookieSettings dependency.

chrome/browser/signin/chrome_signin_manager_delegate.h

+// Copyright 2013 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_SIGNIN_CHROME_SIGNIN_MANAGER_DELEGATE_H_
+#define CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_MANAGER_DELEGATE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/signin/signin_manager_delegate.h"
+
+class CookieSettings;
+class Profile;
+
+class ChromeSigninManagerDelegate : public SigninManagerDelegate {
+ public:
+  explicit ChromeSigninManagerDelegate(Profile* profile);
+  virtual ~ChromeSigninManagerDelegate();
+
+  // Utility methods.
+  static bool ProfileAllowsSigninCookies(Profile* profile);
+  static bool SettingsAllowSigninCookies(CookieSettings* cookie_settings);
+
+  // SigninManagerDelegate implementation.
+  virtual bool AreSigninCookiesAllowed() OVERRIDE;
+
+ private:
+  // Non-owning; this object is owned by the SigninManager, which is
+  // outlived by Profile.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeSigninManagerDelegate);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_CHROME_SIGNIN_MANAGER_DELEGATE_H_