Fix an issue that android doesn't know how to open the download after completion

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

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerDelegate.java
index 8c461ea661348cb0dc9beec9afe5aedea54493b6..f89c87d347cd892886351ab86efc2b8f9a28e66c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerDelegate.java
@@ -27,7 +27,9 @@ public class DownloadManagerDelegate {
             String path, long length, String originalUrl, String referer) {
         DownloadManager manager =
                 (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
-        return manager.addCompletedDownload(fileName, description, true, mimeType, path, length,
+        String newMimeType =
+                ChromeDownloadDelegate.remapGenericMimeType(mimeType, originalUrl, fileName);
+        return manager.addCompletedDownload(fileName, description, true, newMimeType, path, length,
                 false);
     }