Revert removal of code in gtk_util.cc.
Revert removal of code in gtk_util.cc.

This code was removed as part of the cleanup in http://src.chromium.org/viewvc/chrome?view=rev&revision=73432 but is still needed for native dialogs in Chrome OS.

BUG=chromium-os:11884,chromium-os:11969
TEST=manually on netbook

Review URL: http://codereview.chromium.org/6517005

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@74914 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser