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This CL rolls DEPS to the latest version of text-fragments-polyfill,
which fixes a few known issues:
- Link generation should fail if the range includes a block boundary.
- No highlight should be shown if the fragment is ambiguous (i.e., if
  it could correspond to multiple different places on the page).

This version changes the return type of a util function we are using, so
a small update to the Chromium-side JS is needed. (The function now
returns a list of ranges, rather than a list of <mark>s, and Chromium is
responsible for invoking the code to wrap these in <mark> tags.)

Bug: 1136043
Change-Id: Icf9c79dc0d9b9fca23f2826438e3c17c07340bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511429Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823367}