Reverting this as it causes browser tests on the Linux ChromiumOS builder to fail.

chrome/browser/signin/signin_manager.h

Index: chrome/browser/signin/signin_manager.h
===================================================================
--- chrome/browser/signin/signin_manager.h	(revision 150390)
+++ chrome/browser/signin/signin_manager.h	(working copy)
@@ -140,11 +140,6 @@
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
- protected:
-  // Weak pointer to parent profile (protected so FakeSigninManager can access
-  // it).
-  Profile* profile_;
-
  private:
   enum SigninType {
     SIGNIN_TYPE_NONE,
@@ -178,6 +173,8 @@
   void HandleAuthError(const GoogleServiceAuthError& error,
                        bool clear_transient_data);
 
+  Profile* profile_;
+
   // ClientLogin identity.
   std::string possibly_invalid_username_;
   std::string password_;  // This is kept empty whenever possible.