IDL compiler: sync Python to r162649
IDL compiler: sync Python to r162649

Python side to:
Invoke RefPtr::release in GenerateFunctionCallString where possible
https://codereview.chromium.org/85473006

BUG=239771
NOTRY=true
TBR=haraken

Review URL: https://codereview.chromium.org/98143002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@162944 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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