If a download is initiated by download attribute, don't use stream viewer

content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java
index 515306260d1bc03497ab25fbf0ea5bc571108b55..7c87023fc6ac599589ec42a1834a620e803aed08 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewDownloadDelegate.java
@@ -12,8 +12,12 @@ public interface ContentViewDownloadDelegate {
     * Notify the host application that a file should be downloaded. Replaces
     * onDownloadStart from DownloadListener.
     * @param downloadInfo Information about the requested download.
+    * @param mustDownload Whether the content must be downloded. If chrome cannot resolve a MIME
+    *                     type, clicking a link will trigger a download. mustDownload is false if
+    *                     the link has no download attribute and content-disposition is not
+    *                     attachment.
     */
-    void requestHttpGetDownload(DownloadInfo downloadInfo);
+    void requestHttpGetDownload(DownloadInfo downloadInfo, boolean mustDownload);
 
     /**
      * Notify the host application that a download is started.