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AXPosition now uses the deprecated text iterator class for translating DOM offsets to text offsets, and
for calculating text lengths with all uncompressed white space removed.
A text offset in the accessibility tree might not have the same value as the DOM offset for an
equivalent position in the DOM tree, because the DOM may have extra white space that should be collapsed.
This patch switches to using the NGOffsetMapping class in Layout NG for all such calculations.

AX-Relnotes: n/a.

R=dmazzoni@chromium.org, aleventhal@chromium.org

Bug: 1008031
Change-Id: I6953355e83b0953ffa341207bbdde0249cd1b74f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384471
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803471}