Delete the stability file on clean exit.

chrome/browser/metrics/chrome_metrics_service_client.h

Index: chrome/browser/metrics/chrome_metrics_service_client.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.h b/chrome/browser/metrics/chrome_metrics_service_client.h
index e93720286ebfb0523b2c8950ae2b6164518110eb..c2a827ab0149d0d4aaae8523833e8f19fd9b3600 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.h
+++ b/chrome/browser/metrics/chrome_metrics_service_client.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include <deque>
 #include <memory>
 #include <queue>
 #include <string>
@@ -72,6 +73,7 @@ class ChromeMetricsServiceClient
   std::string GetVersionString() override;
   void OnEnvironmentUpdate(std::string* serialized_environment) override;
   void OnLogUploadComplete() override;
+  void OnLogCleanShutdown() override;
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;