Extension settings UI polish: keep extensions expanded after Reload.
Extension settings UI polish: keep extensions expanded after Reload.

BUG=100476
TEST=Reload an extension, note that it's still expanded.

Review URL: http://codereview.chromium.org/8334038

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@108883 0039d316-1c4b-4281-b951-d872f2087c98

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