Re: [presentation-api] navigator.presentation is marked optional in WebIDL

See [discussion at 
TPAC](http://www.w3.org/2016/09/22-webscreens-minutes#ins06)

**PROPOSED RESOLUTION:** For #341, make `navigator.presentation` 
attribute mandatory to align with the normative prose.

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Received on Monday, 26 September 2016 12:11:16 UTC