When the download folder does not exist, change the download folder to a user's "Downloads"

content/browser/download/save_package.h

Index: content/browser/download/save_package.h
diff --git a/content/browser/download/save_package.h b/content/browser/download/save_package.h
index 76e4b62d8607c54fe278f55de34b5627fb5b480c..f2ad1da607fbefccf5b5e3f0e4ce34e346ab3c32 100644
--- a/content/browser/download/save_package.h
+++ b/content/browser/download/save_package.h
@@ -129,6 +129,10 @@ class SavePackage : public base::RefCountedThreadSafe<SavePackage>,
     return TabContentsObserver::tab_contents();
   }
 
+  // Determines the saved file name based on the information of the
+  // current page, and then starts to download the page. This method
+  // runs in the background and may finish asynchronously after this
+  // method returns.
   void GetSaveInfo();
 
   // Statics -------------------------------------------------------------------