IDL compiler: [Constructor] w/o arguments

Initial actual [Constructor] CL: implements constructor w/o arguments.

* Also fixes some inconsistent and excessive line breaks in Perl.

BUG=239771

Review URL: https://codereview.chromium.org/100473006

git-svn-id: svn://svn.chromium.org/blink/trunk@163316 bbb929c8-8fbe-4397-9dbb-9b2b20218538