Removing Variations support for google_update_experiment_id.

chrome/browser/metrics/variations/variations_registry_syncer_win.cc

-// 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.
-
-#include "chrome/browser/metrics/variations/variations_registry_syncer_win.h"
-
-#include "base/files/file_path.h"
-#include "base/metrics/field_trial.h"
-#include "base/path_service.h"
-#include "base/strings/string16.h"
-#include "base/threading/thread_restrictions.h"
-#include "chrome/installer/util/google_update_settings.h"
-#include "chrome/installer/util/install_util.h"
-#include "components/variations/experiment_labels.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace chrome_variations {
-
-namespace {
-
-// Delay before performing a registry sync, in seconds.
-const int kRegistrySyncDelaySeconds = 5;
-
-// Performs the actual synchronization process with the registry, which should
-// be done on a blocking pool thread.
-void SyncWithRegistryOnBlockingPool() {
-  base::ThreadRestrictions::AssertIOAllowed();
-
-  // Note that all registry operations are done here on the UI thread as there
-  // are no threading restrictions on them.
-  base::FilePath chrome_exe;
-  if (!PathService::Get(base::FILE_EXE, &chrome_exe)) {
-    NOTREACHED() << "Failed to get chrome exe path";
-    return;
-  }
-  const bool is_system_install = !InstallUtil::IsPerUserInstall(chrome_exe);
-
-  // Read the current bits from the registry.
-  base::string16 registry_labels;
-  bool success = GoogleUpdateSettings::ReadExperimentLabels(is_system_install,
-                                                            &registry_labels);
-  if (!success) {
-    DVLOG(1) << "Error reading Variation labels from the registry.";
-    return;
-  }
-
-  // Since the non-Variations contents of experiment_labels should not be,
-  // clobbered, separate them from the Variations contents.
-  const base::string16 other_labels =
-      variations::ExtractNonVariationLabels(registry_labels);
-
-  // Compute the new Variations part of the label.
-  base::FieldTrial::ActiveGroups active_groups;
-  base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
-  const base::string16 variation_labels =
-      variations::BuildGoogleUpdateExperimentLabel(active_groups);
-
-  // Append the old non-Variations labels with the new Variations labels and
-  // write it back to the registry.
-  const base::string16 combined_labels =
-      variations::CombineExperimentLabels(variation_labels, other_labels);
-
-  if (!GoogleUpdateSettings::SetExperimentLabels(is_system_install,
-                                                 combined_labels)) {
-    DVLOG(1) << "Error writing Variation labels to the registry: "
-             << combined_labels;
-  }
-}
-
-}  // namespace
-
-VariationsRegistrySyncer::VariationsRegistrySyncer() {
-}
-
-VariationsRegistrySyncer::~VariationsRegistrySyncer() {
-}
-
-void VariationsRegistrySyncer::RequestRegistrySync() {
-  if (timer_.IsRunning()) {
-    timer_.Reset();
-    return;
-  }
-
-  timer_.Start(FROM_HERE,
-               base::TimeDelta::FromSeconds(kRegistrySyncDelaySeconds),
-               this,
-               &VariationsRegistrySyncer::StartRegistrySync);
-}
-
-void VariationsRegistrySyncer::StartRegistrySync() {
-  // Do the work on a blocking pool thread, as chrome://profiler has shown
-  // that it can cause jank if done on the UI thrread.
-  content::BrowserThread::GetBlockingPool()->PostTask(
-      FROM_HERE, base::Bind(&SyncWithRegistryOnBlockingPool));
-}
-
-}  // namespace chrome_variations