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The DistilledPageInfo and related structs are unnecessary, and it is possible
to pass the DomDistillerResult proto around instead. Currently they contain the
same data, and it is all just copied over.

Removing this intermediate step simplifies the code and makes it easier to add
more data to the DomDistillerResult proto and passing it through to
DistilledPageProto.

BUG=409274

Review URL: https://codereview.chromium.org/493853006

Cr-Commit-Position: refs/heads/master@{#293008}