Called before a download begins. |suggested_name| is the suggested name
for the download file. By default the download will be canceled. Execute
|callback| either asynchronously or in this function to continue the
download if desired. Do not keep a reference to |download_item| outside of
this function.
Called before a download begins. |suggested_name| is the suggested name for the download file. By default the download will be canceled. Execute |callback| either asynchronously or in this function to continue the download if desired. Do not keep a reference to |download_item| outside of this function.