IDL compiler: sync Python to r166086

Python side to:
Move V8Utilities::xxxHiddenDependency to V8Binding.h
https://codereview.chromium.org/147843003

BUG=239771
TBR=haraken
NOTRY=true

Review URL: https://codereview.chromium.org/151103003

git-svn-id: svn://svn.chromium.org/blink/trunk@166183 bbb929c8-8fbe-4397-9dbb-9b2b20218538