Delete the stability file on clean exit.

components/metrics/metrics_service_client.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 50 matching lines @@
 
   // Called by the metrics service when a new environment has been recorded.
   // Takes the serialized environment as a parameter. The contents of
   // |serialized_environment| are consumed by the call, but the caller maintains
   // ownership.
   virtual void OnEnvironmentUpdate(std::string* serialized_environment) {}
 
   // Called by the metrics service when a log has been uploaded.
   virtual void OnLogUploadComplete() = 0;
 
+  // Called by the metrics service to record a clean shutdown.
+  virtual void OnLogCleanShutdown() {}
+
   // Gathers metrics that will be filled into the system profile protobuf,
   // calling |done_callback| when complete.
   virtual void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) = 0;
 
   // Called prior to a metrics log being closed, allowing the client to collect
   // extra histograms that will go in that log. Asynchronous API - the client
   // implementation should call |done_callback| when complete.
   virtual void CollectFinalMetricsForLog(
       const base::Closure& done_callback) = 0;
@@ skipping 25 matching lines @@
   // shown during first-run.
   virtual EnableMetricsDefault GetMetricsReportingDefaultState();
 
   // Returns whether cellular logic is enabled for metrics reporting.
   virtual bool IsUMACellularUploadLogicEnabled();
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_