One-time reset of UMA client ids and low entropy source.

chrome/browser/metrics/metrics_log.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/metrics/metrics_log.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 66 matching lines @@
 namespace {
 
 // Returns the date at which the current metrics client ID was created as
 // a string containing seconds since the epoch, or "0" if none was found.
 std::string GetMetricsEnabledDate(PrefService* pref) {
   if (!pref) {
     NOTREACHED();
     return "0";
   }
 
-  return pref->GetString(prefs::kMetricsClientIDTimestamp);
+  return pref->GetString(prefs::kMetricsReportingEnabledTimestamp);
 }
 
 OmniboxEventProto::InputType AsOmniboxEventInputType(
     AutocompleteInput::Type type) {
   switch (type) {
     case AutocompleteInput::INVALID:
       return OmniboxEventProto::INVALID;
     case AutocompleteInput::UNKNOWN:
       return OmniboxEventProto::UNKNOWN;
     case AutocompleteInput::URL:
@@ skipping 794 matching lines @@
     ProductDataToProto(google_update_metrics.google_update_data,
                        google_update->mutable_google_update_status());
   }
 
   if (!google_update_metrics.product_data.version.empty()) {
     ProductDataToProto(google_update_metrics.product_data,
                        google_update->mutable_client_status());
   }
 #endif  // defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
 }