remove use of Local::New with implicit isolate
remove use of Local::New with implicit isolate

R=marja@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/24711003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@158374 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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