Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/signin/signin_tracker.h

Index: chrome/browser/signin/signin_tracker.h
diff --git a/chrome/browser/signin/signin_tracker.h b/chrome/browser/signin/signin_tracker.h
index 64bd8ab8a642490a8ca452a075ba0a6f43d8d7f8..986803831fa08530f2536e85d5111be9987c8ae3 100644
--- a/chrome/browser/signin/signin_tracker.h
+++ b/chrome/browser/signin/signin_tracker.h
@@ -9,6 +9,7 @@
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_types.h"
 #include "google_apis/gaia/google_service_auth_error.h"
+#include "google_apis/gaia/oauth2_token_service.h"
 
 class Profile;
 
@@ -16,11 +17,11 @@ class Profile;
 // responsibilities:
 //
 // SigninTracker (this class) - This class listens to notifications from various
-// services (SigninManager, tokenService, etc) and coalesces them into
+// services (SigninManager, OAuth2TokenService) and coalesces them into
 // notifications for the UI layer. This is the class that encapsulates the logic
 // that determines whether a user is fully logged in or not, and exposes
-// callbacks so various pieces of the UI (OneClickSyncStarter, SyncSetupHandler)
-// can track the current startup state.
+// callbacks so various pieces of the UI (OneClickSyncStarter) can track the
+// current startup state.
 //
 // SyncSetupHandler - This class is primarily responsible for interacting with
 // the web UI for performing system login and sync configuration. Receives
@@ -41,11 +42,15 @@ class Profile;
 // TokenService - Uses credentials provided by SigninManager to generate tokens
 // for all signed-in services in Chrome.
 //
+// OAuth2TokenService - Maintains and manages OAuth2 tokens for the accounts
+// connected to this profile.
+//
 // ProfileSyncService - Provides the external API for interacting with the
 // sync framework. Listens for notifications from the TokenService to know
 // when to startup sync, and provides an Observer interface to notify the UI
 // layer of changes in sync state so they can be reflected in the UI.
-class SigninTracker : public content::NotificationObserver {
+class SigninTracker : public content::NotificationObserver,
+                      public OAuth2TokenService::Observer {
  public:
   class Observer {
    public:
@@ -74,6 +79,10 @@ class SigninTracker : public content::NotificationObserver {
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // OAuth2TokenService::Observer implementation.
+  virtual void OnRefreshTokenAvailable(const std::string& account_id) OVERRIDE;
+  virtual void OnRefreshTokenRevoked(const std::string& account_id) OVERRIDE;
+
   // Returns true if the tokens are loaded for all signed-in services.
   static bool AreServiceTokensLoaded(Profile* profile);