Introduce SigninManagerDelegate and use to eliminate CookieSettings dependency.

chrome/browser/signin/signin_manager.h

Index: chrome/browser/signin/signin_manager.h
diff --git a/chrome/browser/signin/signin_manager.h b/chrome/browser/signin/signin_manager.h
index 85ae6a7a47b2691abf015a2cd3d020b737733709..ce9d6498c8b02cf8e369958404db0421a23d9d7f 100644
--- a/chrome/browser/signin/signin_manager.h
+++ b/chrome/browser/signin/signin_manager.h
@@ -46,6 +46,7 @@ class GaiaAuthFetcher;
 class ProfileIOData;
 class PrefService;
 class SigninGlobalError;
+class SigninManagerDelegate;
 
 class SigninManager : public SigninManagerBase,
                       public GaiaAuthConsumer,
@@ -69,7 +70,7 @@ class SigninManager : public SigninManagerBase,
   // OneClickSigninHelper.
   static const char* kChromeSigninEffectiveSite;
 
-  SigninManager();
+  explicit SigninManager(scoped_ptr<SigninManagerDelegate> delegate);
   virtual ~SigninManager();
 
   // Attempt to sign in this user with ClientLogin. If successful, set a
@@ -265,6 +266,8 @@ class SigninManager : public SigninManagerBase,
   // but before signin is complete.
   OAuthTokenFetchedCallback oauth_token_fetched_callback_;
 
+  scoped_ptr<SigninManagerDelegate> delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(SigninManager);
 };