Fix an issue that download entries in SharedPreferences is not removed when exiting app

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
index 71045581966e282facd0f27ef8825eea041bed64..d8c734060c0921c4e63fecf880edbbee8659fe54 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java
@@ -200,8 +200,7 @@ public class DownloadManagerService extends BroadcastReceiver implements
                     Log.w(TAG, "Download failed: Cleared download id:" + id);
                 }
             }
-            mSharedPrefs.edit().remove(DOWNLOAD_NOTIFICATION_IDS);
-            mSharedPrefs.edit().apply();
+            mSharedPrefs.edit().remove(DOWNLOAD_NOTIFICATION_IDS).apply();
         }
         if (mSharedPrefs.contains(PENDING_OMA_DOWNLOADS)) {
             Set<String> omaDownloads = getStoredDownloadInfo(PENDING_OMA_DOWNLOADS);