IDL compiler: sync Python to r166989

Python side to:
Oilpan: Remove GarbageCollected::ref/deref
https://codereview.chromium.org/156033003

Also fixes formatting in Perl.

BUG=239771
TBR=haraken

Review URL: https://codereview.chromium.org/150883005

git-svn-id: svn://svn.chromium.org/blink/trunk@167005 bbb929c8-8fbe-4397-9dbb-9b2b20218538