Jeff Sharkey 1f5d9af0cd Additional hand-migration to TypedXml interface.
Previous changes have applied mechanical refactorings, but this change
hand-migrates the remaining logic which was too complex to identify.

This change should have no behavior change; famous last words.

Bug: 171832118
Test: manual
Exempt-From-Owner-Approval: trivial refactoring
Change-Id: If2d4b1a354481a83edb4bbcfa22f690b7f5e97c3
2020-11-30 20:45:25 -07:00
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