Make logging of user actions consistent with histograms for OTR.

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 6c2943b1e6476df50240971b5d449f61af77ab1e..af4257784f55565a836173fbe92b309563682db4 100644
--- a/components/metrics/metrics_service_client.h
+++ b/components/metrics/metrics_service_client.h
@@ -41,9 +41,6 @@ class MetricsServiceClient {
   // when metrics recording gets enabled.
   virtual void SetMetricsClientId(const std::string& client_id) = 0;
 
-  // Whether there's an "off the record" (aka "Incognito") session active.
-  virtual bool IsOffTheRecordSessionActive() = 0;
-
   // Returns the product value to use in uploaded reports, which will be used to
   // set the ChromeUserMetricsExtension.product field. See comments on that
   // field on why it's an int32_t rather than an enum.