Remove download resumption feature flag.

chrome/browser/extensions/api/downloads/downloads_api_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.
 
 // Disable everything on windows only. http://crbug.com/306144
 #ifndef OS_WIN
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 298 matching lines @@
 
   void RemoveFilenameDeterminer(content::RenderProcessHost* host) {
     EventRouter::Get(current_browser()->profile())->RemoveEventListener(
         downloads::OnDeterminingFilename::kEventName, host, GetExtensionId());
   }
 
   Browser* current_browser() { return current_browser_; }
 
   // InProcessBrowserTest
   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));
-
     ExtensionApiTest::SetUpOnMainThread();
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&chrome_browser_net::SetUrlRequestMocksEnabled, true));
     InProcessBrowserTest::SetUpOnMainThread();
     GoOnTheRecord();
     CreateAndSetDownloadsDirectory();
     current_browser()->profile()->GetPrefs()->SetBoolean(
         prefs::kPromptForDownload, false);
     GetOnRecordManager()->RemoveAllDownloads();
@@ skipping 3899 matching lines @@
   EXPECT_EQ(downloads::FILENAME_CONFLICT_ACTION_PROMPT, conflict_action);
   EXPECT_FALSE(warnings.empty());
   EXPECT_EQ(Warning::kDownloadFilenameConflict,
             warnings.begin()->warning_type());
   EXPECT_EQ("incumbent", warnings.begin()->extension_id());
 }
 
 }  // namespace extensions
 
 #endif  // http://crbug.com/306144