Revert of suppress user-after-free from blink::WebLocalFrameImpl::setFrameWidget (patchset #1 id:1 of https://codereview.chromium.org/1233803002/)
Revert of suppress user-after-free from blink::WebLocalFrameImpl::setFrameWidget (patchset #1 id:1 of https://codereview.chromium.org/1233803002/)

Reason for revert:
Appears to be fixed as of https://crrev.com/340320

Original issue's description:
> suppress user-after-free from blink::WebLocalFrameImpl::setFrameWidget
>
> TBR=dcheng@chromium.org, dpranke@chromium.org
> BUG=509508
> NOTRY=true
>
> Committed: https://crrev.com/30978ed1372a668c6209fe8aceb20c5c3a512e24
> Cr-Commit-Position: refs/heads/master@{#338467}

TBR=dpranke@chromium.org,zhaoqin@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=509508

Review URL: https://codereview.chromium.org/1260853002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#340611}

ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend