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This patch is the first, (not user visible), fix for a bug with the reading of lines in NVDA.
When the screen reader focus is in the accessibility tree for Views, such as in a context menu, a toolbar
or the main application's menu, the "Read Line" command (NVDAKey+Up) doesn't always read the currently focused item.

We were exposing ignored views in the accessibility tree that was exposed to platform APIs.
As a result, platform specific code under ui/accessibility was building IA2 and ATK hypertext for ignored nodes,
while text navigation code in the same component was trying to locate non-existent line boundaries in that hypertext.

A followup patch will ensure that the names of Views that come from their contents
are clearly marked as such.

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

AX-Relnotes: n/a.

Change-Id: I5fdae5714b10b10db3dc5b5dcf22d118f322e9e7
Bug: 1098528
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435645
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828873}