Just fix little issue that is model_file_type variable but not using it in iOS DEMO.

[tucan9389]

No description provided.

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[tucan9389]

I signed it!

[googlebot]

CLAs look good, thanks!

[tensorflowbutler]

Nagging Reviewer @aselle: It has been 16 days with no activity and the awaiting review label was assigned. Can you please take a look?

[tucan9389]

Why is this awaited a long time?.. Am I missing something for my process?

[tensorflowbutler]

Nagging Reviewer @aselle: It has been 15 days with no activity and the awaiting review label was assigned. Can you please take a look?

[tensorflowbutler]

Nagging Reviewer @aselle: It has been 30 days with no activity and the awaiting review label was assigned. Can you please take a look?

[tensorflowbutler]

Nagging Assignee @rmlarsen: It has been 14 days with no activity and this issue has an assignee. Please update the label and/or status accordingly.