Uber: Narrow the close-button selector to just the child of a page.
Uber: Narrow the close-button selector to just the child of a page.

BUG=118070
TEST=none
R=csilv

Review URL: https://chromiumcodereview.appspot.com/9700005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@126523 0039d316-1c4b-4281-b951-d872f2087c98

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