Remove OnRecordingDisabled() metrics client interface.

chrome/browser/metrics/chrome_metrics_service_client.cc

Index: chrome/browser/metrics/chrome_metrics_service_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index 968ad63d94cee348d825c5651dc01c5987ac4699..f50c205d65b18c665091e7a7a93d554b53867f6e 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -284,13 +284,6 @@ void ChromeMetricsServiceClient::SetMetricsClientId(
   crash_keys::SetMetricsClientIdFromGUID(client_id);
 }
 
-void ChromeMetricsServiceClient::OnRecordingDisabled() {
-  // If we're shutting down, don't drop the metrics_client_id, so that late
-  // crashes won't lose it.
-  if (!g_browser_process->IsShuttingDown())
-    crash_keys::ClearMetricsClientId();
-}
-
 bool ChromeMetricsServiceClient::IsOffTheRecordSessionActive() {
   return chrome::IsIncognitoSessionActive();
 }