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SkTypeface is moving to use SkStreamAsset instead of SkStream. The
implementations are already assuming this, and all users are in
practice already creating the correct types. This change simply
clarifies existing practice and documents actual restrictions.

The Skia side change will be https://codereview.chromium.org/869763002/

Review URL: https://codereview.chromium.org/870133002

Cr-Commit-Position: refs/heads/master@{#313196}