Fix AltSvc host mapping rules.
Fix AltSvc host mapping rules.

Apply host mapping rules consistently to both origin and AltSvc destination in HttpStreamFactoryImpl.

BUG=585876

Review URL: https://codereview.chromium.org/1898293002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#388755}

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