[Cleanup] Const-correct the profile() method for the EasyUnlockService

chrome/browser/signin/signin_manager_factory.h

Index: chrome/browser/signin/signin_manager_factory.h
diff --git a/chrome/browser/signin/signin_manager_factory.h b/chrome/browser/signin/signin_manager_factory.h
index 3d00b066145b085e1666ab4e4a0bd8e90f87bd6b..dec6b6d988e2f913a7d4bf556f16a3aa35a5004c 100644
--- a/chrome/browser/signin/signin_manager_factory.h
+++ b/chrome/browser/signin/signin_manager_factory.h
@@ -42,11 +42,13 @@ class SigninManagerFactory : public BrowserContextKeyedServiceFactory {
   // null if no SigninManager instance currently exists (will not create a new
   // instance).
   static SigninManagerBase* GetForProfileIfExists(Profile* profile);
+  static const SigninManagerBase* GetForProfileIfExists(const Profile* profile);
 #else
   // On non-ChromeOS platforms, the SigninManager the factory creates will be
   // an instance of the extended SigninManager class.
   static SigninManager* GetForProfile(Profile* profile);
   static SigninManager* GetForProfileIfExists(Profile* profile);
+  static const SigninManager* GetForProfileIfExists(const Profile* profile);
 #endif
 
   // Returns an instance of the SigninManagerFactory singleton.