Show the most recent screen shots to user.
Show the most recent screen shots to user.


BUG=123390
TEST=The most recent 2 screen shots are displayed in UI for "choose different screenshots".


Review URL: http://codereview.chromium.org/9972018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@132628 0039d316-1c4b-4281-b951-d872f2087c98

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