[gtk] Update page-info icons to match behavior in page_info_window_view.cc.
[gtk] Update page-info icons to match behavior in page_info_window_view.cc.

BUG=52916
TEST=Verify correct page-info icons in GTK.
Review URL: http://codereview.chromium.org/3502007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@60730 0039d316-1c4b-4281-b951-d872f2087c98

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