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This duplicates the accessibility enums between accessibility and automation converting to camel casing. It also cleans up some of the idl

For the sake of record, attempts to share the same enum ran into the following issues:
- the docs generator assumes a one-to-one (save camel/snake/unix casing) correspondance between filenames and idl namespaces.
- the handlebar templating language does not allow for logical string comparisons/equality checks or passing in-line string literals, so attempting to in-line names was unsuccessful.
- references to the enums (which were cased for the sake of cpp enums), were incorrect for the docs (which want camel casing).

A local cl with the change is still available  but suffers
from odd filename, casing conflicts, and AX* naming issues.

BUG=309681

Review URL: https://codereview.chromium.org/335923003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278011 0039d316-1c4b-4281-b951-d872f2087c98