[subresource_filter] SB throttle can send multiple speculative requests.

chrome/browser/subresource_filter/navigation_throttle_util.cc

Index: chrome/browser/subresource_filter/navigation_throttle_util.cc
diff --git a/chrome/browser/subresource_filter/navigation_throttle_util.cc b/chrome/browser/subresource_filter/navigation_throttle_util.cc
index d5a6fc1cbdd83b4406bbe334a8d54fe943e33502..3cfd9fcefae75406f93fb477b2e49f0e6d884ca7 100644
--- a/chrome/browser/subresource_filter/navigation_throttle_util.cc
+++ b/chrome/browser/subresource_filter/navigation_throttle_util.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/subresource_filter/navigation_throttle_util.h"
 
+#include "base/memory/ptr_util.h"
+#include "base/timer/timer.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "components/safe_browsing_db/database_manager.h"
 #include "components/safe_browsing_db/v4_feature_list.h"
@@ -20,7 +22,10 @@ content::NavigationThrottle* MaybeCreateSubresourceFilterNavigationThrottle(
           safe_browsing::V4FeatureList::V4UsageStatus::V4_ONLY) {
     return new subresource_filter::
         SubresourceFilterSafeBrowsingActivationThrottle(
-            navigation_handle, safe_browsing_service->database_manager());
+            navigation_handle,
+            base::MakeUnique<base::Timer>(false /* retain_user_task */,
+                                          false /* repeating */),
+            safe_browsing_service->database_manager());
   }
   return nullptr;
 }