Revert of Fix accessibility with out-of-process iframes. (patchset #12 id:220001 of https://codereview.chromium.org/
1155993003/)
Reason for revert:
Looks like it introduced a top 10 renderer crashing bug, see crbug/506340.
Original issue's description:
> Fix accessibility with out-of-process iframes.
>
> This patch changes the accessibility tree to attach to lookup the RemoteFrame instead of the RenderFrameImpl (which should not exist).
>
> BUG=490831
>
> Committed: https://crrev.com/
2e72faf30d6054b942cf1cef942343b209bab371
> Cr-Commit-Position: refs/heads/master@{#336804}
TBR=dmazzoni@chromium.org,nasko@chromium.org,lfg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=490831
Review URL: https://codereview.chromium.org/
1221003003
Cr-Commit-Position: refs/heads/master@{#337129}