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Do not return ROLE_SYSTEM_WINDOW ourselves as that is a special MSAA
system role used to indicate a real native window object. It is
automatically created by oleacc.dll as a parent of the root of our
hierarchy, matching the HWND.

For AX_ROLE_WINDOW, we should expose something similar to what Firefox
exposes, namely ROLE_SYSTEM_APPLICATION.

This helps NVDA not read superfluous text when the user navigates
to the toolbar or location bar.

Bug: 794931
Change-Id: I123f07cb477304da1f016d65ea8c2b23b7a92ef4
Reviewed-on: https://chromium-review.googlesource.com/826866Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524102}