Do not recompute client{width,height} the long way in paddingBoxRect
Do not recompute client{width,height} the long way in paddingBoxRect

This patch cleans up a case where paddingBoxRect computing
client{width,height} used content{width,height} and then added the padding.
This was silly because content{width,height} is just the
client{width,height} minus the padding.

Review URL: https://codereview.chromium.org/642823003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@183565 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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