[mac] Make NTP floating style rect 1px thick. Also change the border color.
[mac] Make NTP floating style rect 1px thick. Also change the border color.

Remember: Cocoa coordinates are on 0.5.

http://imgur.com/1IIRZ

TBR=dmaclach

BUG=25941
TEST=Show NTP to ben. He shouldn't scream at you too much.

Review URL: http://codereview.chromium.org/342051

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@30562 0039d316-1c4b-4281-b951-d872f2087c98

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