Move kInstallDate from chrome/common/pref_names.h to components/metrics/metrics_pref_names.h

components/metrics/metrics_service.h

Index: components/metrics/metrics_service.h
diff --git a/components/metrics/metrics_service.h b/components/metrics/metrics_service.h
index b586263749b33f5c8a2ede76bf52da1243663b95..b0dcb82beaa053d5a89fbeed8fefffdb5f2e1f76 100644
--- a/components/metrics/metrics_service.h
+++ b/components/metrics/metrics_service.h
@@ -134,6 +134,9 @@ class MetricsService : public base::HistogramFlattener {
   // recording is not currently running.
   std::string GetClientId();
 
+  // Returns the install date of the application, in seconds since the epoch.
+  int64 GetInstallDate();
+
   // Returns the preferred entropy provider used to seed persistent activities
   // based on whether or not metrics reporting will be permitted on this client.
   //