Enable by default ServiceManagerForDownload in CachedFeatureFlags

The cached and the native flag defaults should match.

This is a step to cleanup the flag.

Change-Id: I83b4f08c5486de8a0dd08422dde4de0bdf53a26b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446554Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813830}

chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/CachedFeatureFlags.java

@@ -52,7 +52,7 @@ public class CachedFeatureFlags {
             put(ChromeFeatureList.CONDITIONAL_TAB_STRIP_ANDROID, false);
             put(ChromeFeatureList.HOMEPAGE_LOCATION_POLICY, false);
             put(ChromeFeatureList.HORIZONTAL_TAB_SWITCHER_ANDROID, false);
-            put(ChromeFeatureList.SERVICE_MANAGER_FOR_DOWNLOAD, false);
+            put(ChromeFeatureList.SERVICE_MANAGER_FOR_DOWNLOAD, true);
             put(ChromeFeatureList.SERVICE_MANAGER_FOR_BACKGROUND_PREFETCH, true);
             put(ChromeFeatureList.COMMAND_LINE_ON_NON_ROOTED, false);
             put(ChromeFeatureList.DOWNLOADS_AUTO_RESUMPTION_NATIVE, true);