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

chrome/browser/services/gcm/gcm_account_tracker.h

Index: chrome/browser/services/gcm/gcm_account_tracker.h
diff --git a/chrome/browser/services/gcm/gcm_account_tracker.h b/chrome/browser/services/gcm/gcm_account_tracker.h
index 9093ba73c122f8626703cf31cb1195389b22f0bd..9da40a6913a5a7310c0ba2f8c1eaef0309bf3669 100644
--- a/chrome/browser/services/gcm/gcm_account_tracker.h
+++ b/chrome/browser/services/gcm/gcm_account_tracker.h
@@ -50,11 +50,9 @@ class GCMAccountTracker : public gaia::AccountTracker::Observer,
   };
 
   // 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