Fix downloaded filename 'download.txt' bug
Fix downloaded filename 'download.txt' bug

As of Chrome 35, the downloaded file would appear with the filename
'download.txt' instead of the custom defined timestamped filename. Use a
JS blob instead of a data URL to download the file so that the filename
sticks.

teddywing/chrome-copy-urls-from-all-tabs,teddywing/chrome-copy-urls-from-all-tabs