Webui: make animation in cookies list a little smoother. BUG=74871 TEST=changing expanding items in the cookies list doesn't cause the items below to jiggle around as much Review URL: http://codereview.chromium.org/6621054
Webui: make animation in cookies list a little smoother.
BUG=74871
TEST=changing expanding items in the cookies list doesn't cause the items below to jiggle around as much
Review URL: http://codereview.chromium.org/6621054

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77308 0039d316-1c4b-4281-b951-d872f2087c98

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