Revert of Fix leaks in InputConnectionHandlerThread

Revert of Fix leaks in InputConnectionHandlerThread (patchset #2 id:20001 of https://codereview.chromium.org/2537073002/ )

Reason for revert:
caused crbug.com/669886

Original issue's description:
> Fix leaks in InputConnectionHandlerThread
>
> On destruction of ContentViewCore and on view detachment, we reset mHandler,
> allowing it a chance to be garbage-collected.
>
> BUG=668692
>
> Committed: https://crrev.com/c703b49a25b8b279fe7cbd1fbfe7ff67493fbf7b
> Cr-Commit-Position: refs/heads/master@{#435136}

TBR=tobiasjs@chromium.org,aelias@chromium.org,yabinh@chromium.org,torne@chromium.org,tedchoc@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668692
Committed: https://crrev.com/0b968c4c01cc7c20f7f8c807a566def4559965af
Cr-Commit-Position: refs/heads/master@{#435506}

[Changwan Ryu, 2016-12-01 00:53:51]

The CQ bit was checked by changwan@chromium.org

[Changwan Ryu, 2016-12-01 00:53:52]

Created Revert of Fix leaks in InputConnectionHandlerThread

[commit-bot: I haz the power, 2016-12-01 00:54:18]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-01 00:55:22]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480553631686790, "parent_rev":
"2fc157f7d6faf8bcf4ced6c990633e4c91babb76", "commit_rev":
"59b10afd29baf216b4fc4d3d75c46899fde8ebe6"}

[commit-bot: I haz the power, 2016-12-01 00:55:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-01 00:58:28]

Description was changed from

==========
Revert of Fix leaks in InputConnectionHandlerThread (patchset #2 id:20001 of
https://codereview.chromium.org/2537073002/ )

Reason for revert:
caused crbug.com/669886

Original issue's description:
> Fix leaks in InputConnectionHandlerThread
> 
> On destruction of ContentViewCore and on view detachment, we reset mHandler,
> allowing it a chance to be garbage-collected.
> 
> BUG=668692
> 
> Committed: https://crrev.com/c703b49a25b8b279fe7cbd1fbfe7ff67493fbf7b
> Cr-Commit-Position: refs/heads/master@{#435136}

TBR=tobiasjs@chromium.org,aelias@chromium.org,yabinh@chromium.org,torne@chrom...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668692
==========

to

==========
Revert of Fix leaks in InputConnectionHandlerThread (patchset #2 id:20001 of
https://codereview.chromium.org/2537073002/ )

Reason for revert:
caused crbug.com/669886

Original issue's description:
> Fix leaks in InputConnectionHandlerThread
>
> On destruction of ContentViewCore and on view detachment, we reset mHandler,
> allowing it a chance to be garbage-collected.
>
> BUG=668692
>
> Committed: https://crrev.com/c703b49a25b8b279fe7cbd1fbfe7ff67493fbf7b
> Cr-Commit-Position: refs/heads/master@{#435136}

TBR=tobiasjs@chromium.org,aelias@chromium.org,yabinh@chromium.org,torne@chrom...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668692

Committed: https://crrev.com/0b968c4c01cc7c20f7f8c807a566def4559965af
Cr-Commit-Position: refs/heads/master@{#435506}
==========

[commit-bot: I haz the power, 2016-12-01 00:58:29]

Patchset 1 (id:??) landed as
https://crrev.com/0b968c4c01cc7c20f7f8c807a566def4559965af
Cr-Commit-Position: refs/heads/master@{#435506}