Revert of GetAccountIdFromProfile() should not return an empty account id if a valid profile is provided.

components/signin/core/browser/fake_signin_manager.cc

 // 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.
 
 #include "components/signin/core/browser/fake_signin_manager.h"
 
 #include "base/callback_helpers.h"
 #include "build/build_config.h"
 #include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/signin_metrics.h"
 
 FakeSigninManagerBase::FakeSigninManagerBase(
     SigninClient* client,
     AccountTrackerService* account_tracker_service)
     : SigninManagerBase(client, account_tracker_service) {}
 
 FakeSigninManagerBase::~FakeSigninManagerBase() {}
 
-void FakeSigninManagerBase::SignIn(const std::string& account_id) {
-  SetAuthenticatedAccountId(account_id);
-}
-
 #if !defined(OS_CHROMEOS)
 
 FakeSigninManager::FakeSigninManager(
     SigninClient* client,
     ProfileOAuth2TokenService* token_service,
     AccountTrackerService* account_tracker_service,
     GaiaCookieManagerService* cookie_manager_service)
     : SigninManager(client,
                     token_service,
                     account_tracker_service,
@@ skipping 55 matching lines @@
   set_password(std::string());
   const std::string account_id = GetAuthenticatedAccountId();
   const std::string username = GetAuthenticatedAccountInfo().email;
   authenticated_account_id_.clear();
 
   FOR_EACH_OBSERVER(SigninManagerBase::Observer, observer_list_,
                     GoogleSignedOut(account_id, username));
 }
 
 #endif  // !defined (OS_CHROMEOS)