Use png_data for favicon of bookmarks imported from HTML
Use png_data for favicon of bookmarks imported from HTML

fix #4339

requires https://github.com/brave/electron/pull/64

Auditors: @bridiver, @bbondy

Test Plan:
1. Import bookmarks from HTML file
2. There should be favicon shows when show favicon option is on

darkdh/browser-laptop,jonathansampson/browser-laptop,willy-b/browser-laptop,darkdh/browser-laptop,darkdh/browser-laptop,pmkary/braver,Sh1d0w/browser-laptop,luixxiul/browser-laptop,pmkary/braver,Sh1d0w/browser-laptop,Sh1d0w/browser-laptop,darkdh/browser-laptop,jonathansampson/browser-laptop,timborden/browser-laptop,jonathansampson/browser-laptop,willy-b/browser-laptop,diasdavid/browser-laptop,jonathansampson/browser-laptop,Sh1d0w/browser-laptop,timborden/browser-laptop,pmkary/braver,dcposch/browser-laptop,luixxiul/browser-laptop,dcposch/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop,timborden/browser-laptop,pmkary/braver,timborden/browser-laptop,willy-b/browser-laptop,dcposch/browser-laptop,diasdavid/browser-laptop,dcposch/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop