WebUI TaskManager: Allow scripts to close windows when opening memory stats
WebUI TaskManager: Allow scripts to close windows when opening memory stats

Set allow_scripts_to_close_windows in WebPreferences to true, when opening "stats for nerd" link (about memory tab).

BUG=chromium-os:19588
TEST=manual


Review URL: http://codereview.chromium.org/8108004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@103751 0039d316-1c4b-4281-b951-d872f2087c98

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