Bug 901360 - (Part 3) Persist download history forever. r=paolo

--HG--
extra : rebase_source : 694428b676809cf0a0c10a81d68e02183d11f780

toolkit/components/jsdownloads/src/DownloadIntegration.jsm

@@ -314,13 +314,15 @@ this.DownloadIntegration = {
     // progress, as well as stopped downloads for which we retained partially
     // downloaded data.  Stopped downloads for which we don't need to track the
     // presence of a ".part" file are only retained in the browser history.
-    // On b2g, we keep a few days of history.
+    // On b2g, we keep a few days of history. On Android we store all history.
 #ifdef MOZ_B2G
     let maxTime = Date.now() -
       Services.prefs.getIntPref("dom.downloads.max_retention_days") * 24 * 60 * 60 * 1000;
     return (aDownload.startTime > maxTime) ||
            aDownload.hasPartialData ||
            !aDownload.stopped;
+#elif defined(MOZ_WIDGET_ANDROID)
+    return true;
 #else
     return aDownload.hasPartialData || !aDownload.stopped;
 #endif