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

chrome/browser/signin/signin_manager_fake.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_SIGNIN_SIGNIN_MANAGER_FAKE_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FAKE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/signin/signin_manager.h"
 
 class Profile;
 class ProfileKeyedService;
 
 // A signin manager that bypasses actual authentication routines with servers
 // and accepts the credentials provided to StartSignIn.
 class FakeSigninManager : public SigninManager {
  public:
-  explicit FakeSigninManager(Profile* profile);
+  FakeSigninManager();
   virtual ~FakeSigninManager();
 
   virtual void StartSignIn(const std::string& username,
                            const std::string& password,
                            const std::string& login_token,
                            const std::string& login_captcha) OVERRIDE;
   virtual void StartSignInWithCredentials(const std::string& session_index,
                                           const std::string& username,
                                           const std::string& password) OVERRIDE;
   virtual void StartSignInWithOAuth(const std::string& username,
                                     const std::string& password) OVERRIDE;
   virtual void SignOut() OVERRIDE;
 
   // Helper function to be used with ProfileKeyedService::SetTestingFactory().
   static ProfileKeyedService* Build(Profile* profile);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FAKE_H_