Reland of Don't allow a widget to send close notifications more than once.

Reland of Don't allow a widget to send close notifications more than once. (patchset #1 id:1 of https://codereview.chromium.org/2844933002/ )

Reason for revert:
We will disable the failing test on Mac.

Original issue's description:
> Revert of Don't allow a widget to send close notifications more than once. (patchset #3 id:40001 of https://codereview.chromium.org/2834943002/ )
> 
> Reason for revert:
> The enabled WidgetObserverTest.ActivationChange test seems to be flaky
> 
> https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/17210
> 
> Original issue's description:
> > Don't allow a widget to send close notifications more than once.
> >
> > Add a test to make sure this works. Also fix a couple WidgetTests that
> > were disabled.
> >
> > BUG=714334
> >
> > Review-Url: https://codereview.chromium.org/2834943002
> > Cr-Commit-Position: refs/heads/master@{#467171}
> > Committed: https://chromium.googlesource.com/chromium/src/+/bf25b17bd99b5dbeff92e62f8dddd289c335dc0a
> 
> TBR=sky@chromium.org,estade@chromium.org
> NOTRY=true
> BUG=714334
> 
> Review-Url: https://codereview.chromium.org/2844933002
> Cr-Commit-Position: refs/heads/master@{#467528}
> Committed: https://chromium.googlesource.com/chromium/src/+/efd8268f95f1c7a212e5b6edd521761dd8a00e31

TBR=sky@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714334
Review-Url: https://codereview.chromium.org/2839403002
Cr-Commit-Position: refs/heads/master@{#467544}
Committed: https://chromium.googlesource.com/chromium/src/+/3a303320be089d790c88890ffc28617415238c5c

[Evan Stade, 2017-04-27 01:49:05]

The CQ bit was checked by estade@chromium.org

[Evan Stade, 2017-04-27 01:49:05]

Created Reland of Don't allow a widget to send close notifications more than
once.

[commit-bot: I haz the power, 2017-04-27 01:49:42]

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, 2017-04-27 01:50:11]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493257745164400, "parent_rev":
"ccf1656dee55dfa118c3c5c8cede9b72c5c78d91", "commit_rev":
"3a303320be089d790c88890ffc28617415238c5c"}

[commit-bot: I haz the power, 2017-04-27 01:50:21]

Description was changed from

==========
Reland of Don't allow a widget to send close notifications more than once.
(patchset #1 id:1 of https://codereview.chromium.org/2844933002/ )

Reason for revert:
We will disable the failing test on Mac.

Original issue's description:
> Revert of Don't allow a widget to send close notifications more than once.
(patchset #3 id:40001 of https://codereview.chromium.org/2834943002/ )
> 
> Reason for revert:
> The enabled WidgetObserverTest.ActivationChange test seems to be flaky
> 
>
https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/17210
> 
> Original issue's description:
> > Don't allow a widget to send close notifications more than once.
> >
> > Add a test to make sure this works. Also fix a couple WidgetTests that
> > were disabled.
> >
> > BUG=714334
> >
> > Review-Url: https://codereview.chromium.org/2834943002
> > Cr-Commit-Position: refs/heads/master@{#467171}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/bf25b17bd99b5dbeff92e62f8ddd...
> 
> TBR=sky@chromium.org,estade@chromium.org
> NOTRY=true
> BUG=714334
> 
> Review-Url: https://codereview.chromium.org/2844933002
> Cr-Commit-Position: refs/heads/master@{#467528}
> Committed:
https://chromium.googlesource.com/chromium/src/+/efd8268f95f1c7a212e5b6edd521...

TBR=sky@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714334
==========

to

==========
Reland of Don't allow a widget to send close notifications more than once.
(patchset #1 id:1 of https://codereview.chromium.org/2844933002/ )

Reason for revert:
We will disable the failing test on Mac.

Original issue's description:
> Revert of Don't allow a widget to send close notifications more than once.
(patchset #3 id:40001 of https://codereview.chromium.org/2834943002/ )
> 
> Reason for revert:
> The enabled WidgetObserverTest.ActivationChange test seems to be flaky
> 
>
https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/17210
> 
> Original issue's description:
> > Don't allow a widget to send close notifications more than once.
> >
> > Add a test to make sure this works. Also fix a couple WidgetTests that
> > were disabled.
> >
> > BUG=714334
> >
> > Review-Url: https://codereview.chromium.org/2834943002
> > Cr-Commit-Position: refs/heads/master@{#467171}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/bf25b17bd99b5dbeff92e62f8ddd...
> 
> TBR=sky@chromium.org,estade@chromium.org
> NOTRY=true
> BUG=714334
> 
> Review-Url: https://codereview.chromium.org/2844933002
> Cr-Commit-Position: refs/heads/master@{#467528}
> Committed:
https://chromium.googlesource.com/chromium/src/+/efd8268f95f1c7a212e5b6edd521...

TBR=sky@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714334

Review-Url: https://codereview.chromium.org/2839403002
Cr-Commit-Position: refs/heads/master@{#467544}
Committed:
https://chromium.googlesource.com/chromium/src/+/3a303320be089d790c88890ffc28...
==========

[commit-bot: I haz the power, 2017-04-27 01:50:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3a303320be089d790c88890ffc28...