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The only purpose of this change is to rename some member
variables and accessors in BrowserAccessibility so that in the
subsequent change we can repurpose BrowserAccessibility to
make use of AXNode instead.

There should be no code logic changes here - just look at
browser_accessibility.h, everything else just follows from
that.

BUG=316726

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262673

Review URL: https://codereview.chromium.org/224803005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262956 0039d316-1c4b-4281-b951-d872f2087c98