Revert "bindings: Removes flaky tests about ArrayBuffer."

This reverts commit 07faa6e91eb3cf94a18abca58b7798804af0bdd1 ,
which is http://crrev.com/647543004 .

The cause of the flakiness was solved by http://crrev.com/638143006 .

BUG=235436

Review URL: https://codereview.chromium.org/667903003

git-svn-id: svn://svn.chromium.org/blink/trunk@184142 bbb929c8-8fbe-4397-9dbb-9b2b20218538