Fix SSLUITest.TestBadHTTPSDownload with PlzNavigate.

chrome/browser/favicon/content_favicon_driver_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/favicon/content/content_favicon_driver.h"
 
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
@@ skipping 56 matching lines @@
       content::AppCacheService* appcache_service,
       content::ResourceType resource_type,
       ScopedVector<content::ResourceThrottle>* throttles) override {
     if (request->url() == url_) {
       was_requested_ = true;
       if (request->load_flags() & net::LOAD_BYPASS_CACHE)
         bypassed_cache_ = true;
     }
   }
 
-  void DownloadStarting(
-      net::URLRequest* request,
-      content::ResourceContext* resource_context,
-      int child_id,
-      int route_id,
-      bool is_content_initiated,
-      bool must_download,
-      ScopedVector<content::ResourceThrottle>* throttles) override {}
-
  private:
   GURL url_;
   bool was_requested_;
   bool bypassed_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(TestResourceDispatcherHostDelegate);
 };
 
 // Checks whether the FaviconDriver is waiting for a download to complete or
 // for data from the FaviconService.
@@ skipping 145 matching lines @@
 
   // A reload ignoring the cache should refetch the favicon from the website.
   {
     PendingTaskWaiter waiter(web_contents(), this);
     chrome::ExecuteCommand(browser(), IDC_RELOAD_BYPASSING_CACHE);
     waiter.Wait();
   }
   ASSERT_TRUE(delegate->was_requested());
   EXPECT_TRUE(delegate->bypassed_cache());
 }