[gtk] Favicon is not updated in popup window

Favicon for popup window should be displayed.
Popup for Windows and ChromeOS(views) was already changed.

R=erg@chromium.org
BUG=257481
TEST=visual test

Review URL: https://codereview.chromium.org/27136002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228513 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228513