Revert "[clock] unittest picker_test.js using assert.include for testing object, not Array or string"

This reverts commit a87b3bc0871ce34ea5305b1012d11fb5088cc6b9.

This commit was from bug 1066988. Reverting due to not having a proper bug number listed in the commit message.
Bug 1066988 - [clock] unittest picker_test.js using assert.include for testing object, not Array or string r=mcav