reintroduce InterceptDownloadResourceThrottle for some OMA DRM downloads

chrome/browser/android/download/chrome_download_delegate.h

Index: chrome/browser/android/download/chrome_download_delegate.h
diff --git a/chrome/browser/android/download/chrome_download_delegate.h b/chrome/browser/android/download/chrome_download_delegate.h
index 28285f898697f9cb814c879bce26b56043dc7226..8862ad680f57b0c54a550a880b90052a51d37483 100644
--- a/chrome/browser/android/download/chrome_download_delegate.h
+++ b/chrome/browser/android/download/chrome_download_delegate.h
@@ -22,6 +22,14 @@ class ChromeDownloadDelegate
   void OnDownloadStarted(const std::string& filename);
   void RequestFileAccess(intptr_t callback_id);
 
+  // TODO(qinmin): consolidate this with the static function above.
+  void EnqueueDownloadManagerRequest(const std::string& url,
+                                     const std::string& user_agent,
+                                     const std::string& content_disposition,
+                                     const std::string& mime_type,
+                                     const std::string& cookie,
+                                     const std::string& referer);
+
  private:
   explicit ChromeDownloadDelegate(content::WebContents* contents);
   friend class content::WebContentsUserData<ChromeDownloadDelegate>;