Fix crashes in DownloadRequestLimiter when extension popups/bubbles initiate downloads automatically

chrome/browser/download/download_request_limiter.h

Index: chrome/browser/download/download_request_limiter.h
diff --git a/chrome/browser/download/download_request_limiter.h b/chrome/browser/download/download_request_limiter.h
index 457de30e5caa4ee737c9855c5803ac1396c9b362..5ca6a8131ca3b7119ab16b3724fab91f9fbe3d41 100644
--- a/chrome/browser/download/download_request_limiter.h
+++ b/chrome/browser/download/download_request_limiter.h
@@ -224,7 +224,7 @@ class DownloadRequestLimiter
 
   // Does the work of updating the download status on the UI thread and
   // potentially prompting the user.
-  void CanDownloadImpl(TabContentsWrapper* originating_tab,
+  void CanDownloadImpl(content::WebContents* originating_contents,
                        int request_id,
                        const std::string& request_method,
                        const Callback& callback);