Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/browser/loader/navigation_resource_throttle.cc

Index: content/browser/loader/navigation_resource_throttle.cc
diff --git a/content/browser/loader/navigation_resource_throttle.cc b/content/browser/loader/navigation_resource_throttle.cc
index b8787626e829a86be9c43a5583d41c5bfe093eab..dcdceaea91c8e47c1c9e03dcf01e229181bba9f2 100644
--- a/content/browser/loader/navigation_resource_throttle.cc
+++ b/content/browser/loader/navigation_resource_throttle.cc
@@ -354,7 +354,8 @@ void NavigationResourceThrottle::OnUIChecksPerformed(
     CancelAndIgnore();
   } else if (result == NavigationThrottle::CANCEL) {
     Cancel();
-  } else if (result == NavigationThrottle::BLOCK_REQUEST) {
+  } else if (result == NavigationThrottle::BLOCK_REQUEST ||
+             result == NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE) {
     CancelWithError(net::ERR_BLOCKED_BY_CLIENT);
   } else if (result == NavigationThrottle::BLOCK_RESPONSE) {
     // TODO(mkwst): If we cancel the main frame request with anything other than