Merge ShapeInfo & ShapeOutsideInfo now that ShapeInsideInfo is no more

Now that ShapeInsideInfo is gone, having a class hiearachy and templates
doesn't make any sense. As a first step to cleaning up the code, this remove
ShapeInfo and puts all of its functionality into ShapeOutsideInfo.

R=leviw@chromium.org

Review URL: https://codereview.chromium.org/227733005

git-svn-id: svn://svn.chromium.org/blink/trunk@171003 bbb929c8-8fbe-4397-9dbb-9b2b20218538