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I discovered that AXObject::Language() was not always returning the
correct thing for the root element. The rest of the tree had the
right value, but not the root.

I updated an existing test to cover the case where the document's
language is something other than English.

AX-Relnotes: Fixes the computed language for some web pages.
Bug: none
Change-Id: I3e3bec73e9bded0df3c37bb3c8ba634d3d5018b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226338
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Chris Hall <chrishall@chromium.org>
Auto-Submit: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774704}