Enable NTPTilesInInstantService by default

chrome/browser/safe_browsing/threat_details_unittest.cc

Index: chrome/browser/safe_browsing/threat_details_unittest.cc
diff --git a/chrome/browser/safe_browsing/threat_details_unittest.cc b/chrome/browser/safe_browsing/threat_details_unittest.cc
index 4926851b4e85d70553e267f70b954c6252698ce4..9690e2f66f5eb1dda9ffd36837a806e068e02ae2 100644
--- a/chrome/browser/safe_browsing/threat_details_unittest.cc
+++ b/chrome/browser/safe_browsing/threat_details_unittest.cc
@@ -207,11 +207,6 @@ class ThreatDetailsTest : public ChromeRenderViewHostTestHarness {
                                                 false /* no_db */));
   }
 
-  void TearDown() override {
-    profile()->DestroyHistoryService();
-    ChromeRenderViewHostTestHarness::TearDown();
-  }
-
   static bool ResourceLessThan(
       const ClientSafeBrowsingReportRequest::Resource* lhs,
       const ClientSafeBrowsingReportRequest::Resource* rhs) {