Primitive protocol should have capital name

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Migrated from https://bugs.webkit.org/show_bug.cgi?id=177097:

At 2017-09-18T19:49:11Z, fpizlo@apple.com wrote:
Patch forthcoming.

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At 2017-09-18T19:49:30Z, fpizlo@apple.com wrote:
All of our other protocols start with capital letters. Primitive should be "Primitive", not "primitive".

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At 2017-09-19T15:53:37Z, fpizlo@apple.com wrote:
Created attachment 321198
the patch

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At 2017-09-19T18:26:57Z, jfbastien@apple.com wrote:
Comment on attachment 321198
the patch

r=me

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At 2017-09-19T18:28:43Z, fpizlo@apple.com wrote:
Landed in https://trac.webkit.org/changeset/222215/webkit

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At 2017-09-27T19:25:11Z, webkit-bug-importer@group.apple.com wrote:
rdar://problem/34693239