Remove OnRecordingDisabled() metrics client interface.

chrome/browser/metrics/metrics_reporting_state.h

Index: chrome/browser/metrics/metrics_reporting_state.h
diff --git a/chrome/browser/metrics/metrics_reporting_state.h b/chrome/browser/metrics/metrics_reporting_state.h
index 89c1dc705d035fd66cb8db4b7428ee071565b62c..63f639383abf074251abba5499ddad775810729b 100644
--- a/chrome/browser/metrics/metrics_reporting_state.h
+++ b/chrome/browser/metrics/metrics_reporting_state.h
@@ -26,6 +26,11 @@ void ChangeMetricsReportingStateWithReply(
     bool enabled,
     const OnMetricsReportingCallbackType& callback_fn);
 
+// Update metrics prefs on a permission (opt-in/out) change. When opting out,
+// this clears various client ids. When opting in, this resets saving crash
+// prefs, so as not to trigger upload of various stale data.
+void UpdateMetricsPrefsOnPermissionChange(bool metrics_enabled);
+
 // Returns whether MetricsReporting can be modified by the user (except
 // Android).
 bool IsMetricsReportingPolicyManaged();