Remove unused builders.jsonp file

This is generated elsewhere and this file is unused.

R=ojan@chromium.org
BUG=333357

Review URL: https://codereview.chromium.org/133603004

git-svn-id: svn://svn.chromium.org/blink/trunk@164907 bbb929c8-8fbe-4397-9dbb-9b2b20218538