Removing Variations support for google_update_experiment_id.

chrome/browser/metrics/variations/variations_registry_syncer_win.h

-// Copyright (c) 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_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
-#define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
-
-#include "base/macros.h"
-#include "base/timer/timer.h"
-
-namespace chrome_variations {
-
-// This class manages synchronizing active VariationIDs with the Google Update
-// experiment_labels value in the registry.
-class VariationsRegistrySyncer {
- public:
-  VariationsRegistrySyncer();
-  ~VariationsRegistrySyncer();
-
-  // Starts a timer that, when it expires, updates the registry with the current
-  // Variations associated with Google Update. If the timer is already running,
-  // calling this just resets the timer.
-  void RequestRegistrySync();
-
- private:
-  // Starts the actual synchronization process with the registry. Posts a task
-  // to do it on the blocking pool to avoid jank.
-  void StartRegistrySync();
-
-  // A timer used to delay the writes to the registry. This is done to optimize
-  // the case where lazy-loaded features start their field trials some time
-  // after initial batch of field trials are created, and also to avoid blocking
-  // the UI thread. The timer effectively allows this class to batch together
-  // update requests, to avoid reading and writing from the registry too much.
-  base::OneShotTimer timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(VariationsRegistrySyncer);
-};
-
-}  // namespace chrome_variations
-
-#endif  // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_