DevTools: remove layout boundary caching from View, leave it in SplitView only.

R=dgozman@chromium.org

Review URL: https://codereview.chromium.org/247973002

git-svn-id: svn://svn.chromium.org/blink/trunk@172369 bbb929c8-8fbe-4397-9dbb-9b2b20218538