Move kInstallDate from chrome/common/pref_names.h to components/metrics/metrics_pref_names.h

components/metrics/metrics_pref_names.cc

 // 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.
 
 #include "components/metrics/metrics_pref_names.h"
 
 namespace metrics {
 namespace prefs {
 
+// Set once, to the current epoch time, on the first run of chrome on this
+// machine. Attached to metrics reports forever thereafter.
+const char kInstallDate[] = "uninstall_metrics.installation_date2";
+
 // The metrics client GUID.
 // Note: The name client_id2 is a result of creating
 // new prefs to do a one-time reset of the previous values.
 const char kMetricsClientID[] = "user_experience_metrics.client_id2";
 
 // Array of strings that are each UMA logs that were supposed to be sent in the
 // first minute of a browser session. These logs include things like crash count
 // info, etc.
 const char kMetricsInitialLogs[] =
     "user_experience_metrics.initial_logs_list";
@@ skipping 108 matching lines @@
     "user_experience_metrics.stability.stats_version";
 
 // The keys below are strictly increasing counters over the lifetime of
 // a chrome installation. They are (optionally) sent up to the uninstall
 // survey in the event of uninstallation.
 const char kUninstallLaunchCount[] = "uninstall_metrics.launch_count";
 const char kUninstallMetricsUptimeSec[] = "uninstall_metrics.uptime_sec";
 
 }  // namespace prefs
 }  // namespace metrics