GTK: Fix theme overlay in off the record mode.
GTK: Fix theme overlay in off the record mode.

We weren't detecting whether we were in OTR mode like we were in
opaque_browser_frame_view.cc.

BUG=21046
TEST=none

Review URL: http://codereview.chromium.org/553125

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@37322 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