gtk: Allow text selection in the page info bubble.
gtk: Allow text selection in the page info bubble.

BUG=52526
TEST=Try going to any web page and click on either the padlock or the globe
icon. The text within the bubble should be selectable.

R=finnur@chromium.org

Review URL: http://codereview.chromium.org/6675044

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@79833 0039d316-1c4b-4281-b951-d872f2087c98

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