Make WebFrameTest to not need soon-to-be-removed Persistent handle operations.
Make WebFrameTest to not need soon-to-be-removed Persistent handle operations.

BUG=236290

Review URL: https://chromiumcodereview.appspot.com/15769013

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151847 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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