Rails 5: put RequestThrottle in the right place
Rails 5: put RequestThrottle in the right place

ParamsParser isn't used in Rails 5 anymore (I think they just moved
it out middleware)

Change-Id: I5efb9cb779e6bd9863fd4093629b9415174269ff
Reviewed-on: https://gerrit.instructure.com/95546
Tested-by: Jenkins
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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