Remove OnRecordingDisabled() metrics client interface.

components/metrics/metrics_service_client.h

Index: components/metrics/metrics_service_client.h
diff --git a/components/metrics/metrics_service_client.h b/components/metrics/metrics_service_client.h
index 8624477d567b58866d037cffe13f47715a223ac4..6c2943b1e6476df50240971b5d449f61af77ab1e 100644
--- a/components/metrics/metrics_service_client.h
+++ b/components/metrics/metrics_service_client.h
@@ -41,10 +41,6 @@ class MetricsServiceClient {
   // when metrics recording gets enabled.
   virtual void SetMetricsClientId(const std::string& client_id) = 0;
 
-  // Notifies the client that recording is disabled, so that other services
-  // (such as crash reporting) can clear any association with metrics.
-  virtual void OnRecordingDisabled() = 0;
-
   // Whether there's an "off the record" (aka "Incognito") session active.
   virtual bool IsOffTheRecordSessionActive() = 0;