Log predictor database size on startup

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 5897d9d3fb9eb8e1823d468fa34e402db1fdbb87..a0dbec34f9f0359b18e3bb5ec7f3c9cc0cbbd72b 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -484,6 +484,8 @@ class Predictor {
   // Applies the HSTS redirect for |url|, if any.
   GURL GetHSTSRedirectOnIOThread(const GURL& url);
 
+  void LogStartupMetrics();
+
   // ------------- End IO thread methods.
 
   std::unique_ptr<InitialObserver> initial_observer_;