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Revert of Add fuzzer for AXTree and fix a couple of bugs it found. (patchset #3 id:40001 of https://codereview.chromium.org/2323103002/ )

Reason for revert:
Caused Address Sanitizer problem with BrowserAccessibilityManagerTest.TestFatalError

BUG=646777

Original issue's description:
> Add fuzzer for AXTree and fix a couple of bugs it found.
>
> BUG=none
>
> Committed: https://crrev.com/cd760f121c0701c0f7609a3437735751cf4ac416
> Cr-Commit-Position: refs/heads/master@{#418308}

TBR=aarya@google.com,aboxhall@chromium.org,mmoroz@chromium.org,ochang@chromium.org,dmazzoni@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Review-Url: https://codereview.chromium.org/2346473002
Cr-Commit-Position: refs/heads/master@{#418541}