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Serialization support of metafiles will soon be expanded to handle
font typefaces.  Clarify the naming of the existing support for pictures
ahead of the addition of contextual support for typefaces.

Bug: 1044996
Change-Id: I4e8f52026276a6a5e5b81f77818b1022d3f24033
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264619Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782040}