Use lossy prefs in the net predictor, and update them more frequently

chrome/browser/net/predictor_browsertest.cc

Index: chrome/browser/net/predictor_browsertest.cc
diff --git a/chrome/browser/net/predictor_browsertest.cc b/chrome/browser/net/predictor_browsertest.cc
index af2a1b26f0c70ed3f1fac2128e4a5de14affd97b..6e0277c3da82434620b99def7831f7ce499fcc65 100644
--- a/chrome/browser/net/predictor_browsertest.cc
+++ b/chrome/browser/net/predictor_browsertest.cc
@@ -1362,6 +1362,9 @@ IN_PROC_BROWSER_TEST_F(PredictorBrowserTest,
   PrepareFrameSubresources(referring_url_);
   PrepareFrameSubresources(referring_url_);
   PrepareFrameSubresources(referring_url_);
+
+  // The onload event is required to persist prefs.
+  ui_test_utils::NavigateToURL(browser(), referring_url_);
 }
 
 IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, ShutdownStartupCyclePreresolve) {
@@ -1380,6 +1383,9 @@ IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, PRE_ClearData) {
   // The target url will have a expected connection count of 2 after this call.
   InstallPredictorObserver(referring_url_, target_url_);
   LearnFromNavigation(referring_url_, target_url_);
+
+  // The onload event is required to persist prefs.
+  ui_test_utils::NavigateToURL(browser(), referring_url_);
 }
 
 // Ensure predictive data is cleared when the history is cleared.