Correct IsClosing() calculation in slide_animation.h
Correct IsClosing() calculation in slide_animation.h

http://crbug.com/14786
TEST=set bookmark bar to show by default. open a new browser window. There should be no weird vertical scrolling at the bottom of the page.

Review URL: http://codereview.chromium.org/145002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@18955 0039d316-1c4b-4281-b951-d872f2087c98

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