Remove IAccessible2Proxy
It was added for chrome frame testing, but chrome frame is no more.
Nothing depends on this target nowadays.
It doesn't build with clang/win, and the only reason we didn't notice
is because the 'all' target doesn't include all targets in gyp. The
gn build gets this right. Since this target doesn't build with
clang/win and is unused, just delete it.
BUG=82385
Review URL: https://codereview.chromium.org/1521443002
Cr-Commit-Position: refs/heads/master@{#364511}
4 files changed
