Enable download resumption by default.

content/public/common/content_features.h

 // 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.
 
 // This file defines all the public base::FeatureList features for the content
 // module.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 
+#include "base/feature_list.h"
 #include "build/build_config.h"
-#include "base/feature_list.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
+CONTENT_EXPORT extern const base::Feature kDownloadResumptionFeature;
+
 #if defined(OS_ANDROID)
 // FeatureList definition for the Seccomp field trial.
 CONTENT_EXPORT extern const base::Feature kSeccompSandboxAndroidFeature;
 #endif  // defined(OS_ANDROID)
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_