Make the OutdatedBuildDetector feature static.

chrome/browser/upgrade_detector_impl.cc

 // Copyright (c) 2012 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/upgrade_detector_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 360 matching lines @@
   // We use FILE as the thread to run the upgrade detection code on all
   // platforms. For Linux, this is because we don't want to block the UI thread
   // while launching a background process and reading its output; on the Mac and
   // on Windows checking for an upgrade requires reading a file.
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&UpgradeDetectorImpl::DetectUpgradeTask,
                                      weak_factory_.GetWeakPtr()));
 }
 
 bool UpgradeDetectorImpl::DetectOutdatedInstall() {
-  constexpr base::Feature kOutdatedBuildDetector =
-      { "OutdatedBuildDetector", base::FEATURE_ENABLED_BY_DEFAULT };
+  static constexpr base::Feature kOutdatedBuildDetector = {
+      "OutdatedBuildDetector", base::FEATURE_ENABLED_BY_DEFAULT};
 
   if (!base::FeatureList::IsEnabled(kOutdatedBuildDetector))
     return false;
 
   // Don't show the bubble if we have a brand code that is NOT organic, unless
   // an outdated build is being simulated by command line switches.
   static bool simulate_outdated = SimulatingOutdated();
   if (!simulate_outdated) {
     std::string brand;
     if (google_brand::GetBrand(&brand) && !google_brand::IsOrganic(brand))
@@ skipping 113 matching lines @@
 
 // static
 UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
   return base::Singleton<UpgradeDetectorImpl>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorImpl::GetInstance();
 }