Updating CustomElement lifecycle scope logic
Updating CustomElement lifecycle scope logic

More closely following what V8 is doing in:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/scripts/code_generator_v8.pm&l=1725

Primary issue was that this was being emitted in too many places (getters and attributes which didn't need it).

BUG=
R=vsm@google.com

Review URL: https://codereview.chromium.org//25675008

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@28818 260f80e4-7a28-3924-810f-c04153c831b5

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