Revert of Remove OneClickSigninHelper since it is no longer used.

chrome/browser/ui/webui/signin/inline_login_handler_impl.h

 // Copyright 2013 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_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_IMPL_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_IMPL_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 19 matching lines @@
   }
 
   Browser* GetDesktopBrowser();
   void SyncStarterCallback(OneClickSigninSyncStarter::SyncSetupResult result);
   // Closes the current tab and shows the account management view of the avatar
   // bubble if |show_account_management| is true.
   void CloseTab(bool show_account_management);
   void HandleLoginError(const std::string& error_msg);
 
  private:
-  friend class InlineLoginUIBrowserTest;
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest, CanOfferNoProfile);
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest, CanOffer);
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest, CanOfferProfileConnected);
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest,
-                           CanOfferUsernameNotAllowed);
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest, CanOfferWithRejectedEmail);
-  FRIEND_TEST_ALL_PREFIXES(InlineLoginUIBrowserTest, CanOfferNoSigninCookies);
-
-  // Argument to CanOffer().
-  enum CanOfferFor {
-    CAN_OFFER_FOR_ALL,
-    CAN_OFFER_FOR_SECONDARY_ACCOUNT
-  };
-
-  static bool CanOffer(Profile* profile,
-                       CanOfferFor can_offer_for,
-                       const std::string& email,
-                       std::string* error_message);
-
   // InlineLoginHandler overrides:
   void SetExtraInitParams(base::DictionaryValue& params) override;
   void CompleteLogin(const base::ListValue* args) override;
 
   // Overridden from content::WebContentsObserver overrides.
   void DidCommitProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& url,
       ui::PageTransition transition_type) override;
 
   // True if the user has navigated to untrusted domains during the signin
   // process.
   bool confirm_untrusted_signin_;
 
   base::WeakPtrFactory<InlineLoginHandlerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InlineLoginHandlerImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_IMPL_H_