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This changes the |ElementFinder::Result| to be split into different
data chunks.

This refactoring is done for the ElementStore, which is supposed
to only store the |ResultData| part (instead of the full |Result|).

Bug: b/172328014
Change-Id: I9e0f6aea5b5619feb6e326f6262e0ceaf8176d74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519458
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827249}