Fix GTK build; update function call per r249108.

http://crrev.com/249108 changed a function name.
Update a GTK use of that function name to fix the build.

BUG=NONE
TEST=GTK Chrome builds.
R=thakis@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/156263002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249173 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249173