RefPtr several Frame* iterations
RefPtr several Frame* iterations

BUG=178264
TEST=N/A

Review URL: https://chromiumcodereview.appspot.com/14735007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149904 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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