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

chrome/browser/download/download_manager.h

Index: chrome/browser/download/download_manager.h
diff --git a/chrome/browser/download/download_manager.h b/chrome/browser/download/download_manager.h
index 79018bec672195496af041f0f6dbaff25c8d91de..68f98a964482b83d05458a6f02d5552ef7e4fdfb 100644
--- a/chrome/browser/download/download_manager.h
+++ b/chrome/browser/download/download_manager.h
@@ -86,7 +86,9 @@ class DownloadManager
     // Called immediately after the DownloadManager puts up a select file
     // dialog.
     // |id| indicates which download opened the dialog.
-    virtual void SelectFileDialogDisplayed(int32 id) {}
+    // |suggested_path| indicates the path suggested in the dialog.
+    virtual void SelectFileDialogDisplayed(
+        int32 id, FilePath& suggested_path) {}
 
    protected:
     virtual ~Observer() {}