[w3c/payment-handler] Add [SecureContext, SameObject] to paymentManager attribute (#293)

We don't need to create a new object when accessing paymentManager
attribute. So, we just add `[SameObject]`.

This PR also adds [SecureContext] to the attribute because it is only
allowed in secure context.

Implementation commitment:

 * [x] Chrome (http://crrev.com/c/1013660)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/293

-- Commit Summary --

  * Add [SecureContext, SameObject] to paymentManager attribute

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/293.patch
https://github.com/w3c/payment-handler/pull/293.diff

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