Remove download resumption feature flag.

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2012 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 "chrome/browser/download/download_browsertest.h"
 
 #include <stdint.h>
 #include <sstream>
 #include <utility>
 
@@ skipping 400 matching lines @@
   };
 
   struct FileErrorInjectInfo {
     DownloadInfo download_info;
     content::TestFileErrorInjector::FileErrorInfo error_info;
   };
 
   DownloadTest() {}
 
   void SetUpOnMainThread() override {
-    base::FeatureList::ClearInstanceForTesting();
-    std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
-    feature_list->InitializeFromCommandLine(
-        features::kDownloadResumption.name, std::string());
-    base::FeatureList::SetInstance(std::move(feature_list));
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&chrome_browser_net::SetUrlRequestMocksEnabled, true));
     ASSERT_TRUE(InitialSetup());
   }
 
   void TearDownOnMainThread() override {
     // Needs to be torn down on the main thread. file_activity_observer_ holds a
     // reference to the ChromeDownloadManagerDelegate which should be destroyed
     // on the UI thread.
@@ skipping 3233 matching lines @@
       DangerousDownloadWaiter(
           browser(), 1,
           content::DownloadTestObserver::ON_DANGEROUS_DOWNLOAD_DENY));
   ui_test_utils::NavigateToURL(browser(), extension_url);
 
   observer->WaitForFinished();
 
   // Download shelf should close.
   EXPECT_FALSE(browser()->window()->IsDownloadShelfVisible());
 }