Enable download resumption by default.

chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc

Index: chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
diff --git a/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc b/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
index 6e8821deb6a07318fc6090583a6ed51d226b90df..6f78404217a53e972c96c3a9a644c860635d99b6 100644
--- a/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
+++ b/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
@@ -37,7 +37,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/common/content_switches.h"
+#include "content/public/common/content_features.h"
 #include "content/public/test/download_test_observer.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/notification_types.h"
@@ -309,6 +309,12 @@ class DownloadExtensionTest : public ExtensionApiTest {
 
   // InProcessBrowserTest
   void SetUpOnMainThread() override {
+    base::FeatureList::ClearInstanceForTesting();
+    scoped_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,
@@ -3858,8 +3864,6 @@ IN_PROC_BROWSER_TEST_F(
 IN_PROC_BROWSER_TEST_F(
     DownloadExtensionTest,
     MAYBE_DownloadExtensionTest_OnDeterminingFilename_InterruptedResume) {
-  base::CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableDownloadResumption);
   LoadExtension("downloads_split");
   ASSERT_TRUE(StartEmbeddedTestServer());
   GoOnTheRecord();