[GCM] Check-in with signed in accounts associates device to user

chrome/browser/services/gcm/gcm_account_tracker.h

 // Copyright 2014 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_SERVICES_GCM_GCM_ACCOUNT_TRACKER_H_
 #define CHROME_BROWSER_SERVICES_GCM_GCM_ACCOUNT_TRACKER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 32 matching lines @@
 
     // Email address of the tracked account.
     std::string email;
     // OAuth2 access token, when |state| is TOKEN_PRESENT.
     std::string access_token;
     // Status of the token fetching.
     AccountState state;
   };
 
   // Callback for the GetAccountsForCheckin call. |account_tokens| maps email
-  // addresses to OAuth2 access tokens. |account_removed| indicates whether an
-  // account has been removed since the last time the callback was called.
-  typedef base::Callback<
-      void(const std::map<std::string, std::string>& account_tokens,
-           bool account_removed)> UpdateAccountsCallback;
+  // addresses to OAuth2 access tokens.
+  typedef base::Callback<void(const std::map<std::string, std::string>&
+                                  account_tokens)> UpdateAccountsCallback;
 
   // Creates an instance of GCMAccountTracker. |account_tracker| is used to
   // deliver information about the account, while |callback| will be called
   // once all of the accounts have been fetched a necessary OAuth2 token, as
   // many times as the list of accounts is stable, meaning that all accounts
   // are known and there is no related activity in progress for them, like
   // fetching OAuth2 tokens.
   GCMAccountTracker(scoped_ptr<gaia::AccountTracker> account_tracker,
                     const UpdateAccountsCallback& callback);
   virtual ~GCMAccountTracker();
@@ skipping 58 matching lines @@
   bool shutdown_called_;
 
   ScopedVector<OAuth2TokenService::Request> pending_token_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMAccountTracker);
 };
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_GCM_ACCOUNT_TRACKER_H_