sync: Refactor StatusChangeChecker hierarchy

chrome/browser/sync/test/integration/quiesce_status_change_checker.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_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
 // precisely the wrong time, we could end up seeing stale snapshot state
 // (crbug.com/95742), which would make us think that the client has finished
 // syncing when it hasn't.  In practice, this race is rare enough that it
 // doesn't cause test failures.
 class QuiesceStatusChangeChecker : public StatusChangeChecker {
  public:
   explicit QuiesceStatusChangeChecker(
       std::vector<ProfileSyncService*> services);
   virtual ~QuiesceStatusChangeChecker();
 
-  // Timeout length for this operation.  Default is 45s.
-  virtual base::TimeDelta GetTimeoutDuration();
-
   // Blocks until all clients have quiesced or we time out.
   void Wait();
 
   // A callback function for some helper objects.
   void OnServiceStateChanged(ProfileSyncService* service);
 
-  // A callback for when the time limit is exceeded.
-  void OnTimeout();
-
+  // Implementation of StatusChangeChecker.
   virtual bool IsExitConditionSatisfied() OVERRIDE;
   virtual std::string GetDebugMessage() const OVERRIDE;
 
-  bool TimedOut() const;
-
  private:
   std::vector<ProfileSyncService*> services_;
   ScopedVector<ProgressMarkerWatcher> observers_;
-  bool timed_out_;
 
   DISALLOW_COPY_AND_ASSIGN(QuiesceStatusChangeChecker);
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_