Add a flag showing whether the current request was ignored by a handler

chrome/browser/errorpage_browsertest.cc

Index: chrome/browser/errorpage_browsertest.cc
diff --git a/chrome/browser/errorpage_browsertest.cc b/chrome/browser/errorpage_browsertest.cc
index 3f990b789edb3e009ede1c894306bd0fcd6daf54..f89164be1b2aae7daabd39a80f66a9b4c58fded0 100644
--- a/chrome/browser/errorpage_browsertest.cc
+++ b/chrome/browser/errorpage_browsertest.cc
@@ -485,7 +485,8 @@ class TestFailProvisionalLoadObserver : public content::WebContentsObserver {
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
       int error_code,
-      const base::string16& error_description) override {
+      const base::string16& error_description,
+      bool was_ignored_by_handler) override {
     fail_url_ = validated_url;
   }