Revert of Streams: Remove isTerminating() calls

Revert of Streams: Remove isTerminating() calls (patchset #3 id:40001 of https://codereview.chromium.org/2265863002/ )

Reason for revert:
This causes crashes (see https://bugs.chromium.org/p/chromium/issues/detail?id=640521)

Original issue's description:
> Streams: Remove isTerminating() calls
>
> isTerminating() is used for making sure whether a worker execution context is
> still valid after V8 API calls, but this is no longer necessary thanks to
> graceful shutdown mechanism for WorkerThread (https://crbug.com/487050)
>
> BUG=614272, 638877
>
> Committed: https://crrev.com/53752ac68bbd8b93650a9475c9b5b5f2e13a8e9a
> Cr-Commit-Position: refs/heads/master@{#413420}

TBR=yhirano@chromium.org,haraken@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=614272, 638877
Committed: https://crrev.com/360cedf2865c54108fa97f246737454ff68fc9ad
Cr-Commit-Position: refs/heads/master@{#414062}

[nhiroki, 2016-08-24 11:16:22]

The CQ bit was checked by nhiroki@chromium.org

[nhiroki, 2016-08-24 11:16:22]

Created Revert of Streams: Remove isTerminating() calls

[commit-bot: I haz the power, 2016-08-24 11:16:41]

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

[haraken, 2016-08-24 11:16:53]

LGTM

[commit-bot: I haz the power, 2016-08-24 13:31:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-24 13:32:59]

Description was changed from

==========
Revert of Streams: Remove isTerminating() calls (patchset #3 id:40001 of
https://codereview.chromium.org/2265863002/ )

Reason for revert:
This causes crashes (see
https://bugs.chromium.org/p/chromium/issues/detail?id=640521)

Original issue's description:
> Streams: Remove isTerminating() calls
> 
> isTerminating() is used for making sure whether a worker execution context is
> still valid after V8 API calls, but this is no longer necessary thanks to
> graceful shutdown mechanism for WorkerThread (https://crbug.com/487050)
> 
> BUG=614272, 638877
> 
> Committed: https://crrev.com/53752ac68bbd8b93650a9475c9b5b5f2e13a8e9a
> Cr-Commit-Position: refs/heads/master@{#413420}

TBR=yhirano@chromium.org,haraken@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=614272, 638877
==========

to

==========
Revert of Streams: Remove isTerminating() calls (patchset #3 id:40001 of
https://codereview.chromium.org/2265863002/ )

Reason for revert:
This causes crashes (see
https://bugs.chromium.org/p/chromium/issues/detail?id=640521)

Original issue's description:
> Streams: Remove isTerminating() calls
>
> isTerminating() is used for making sure whether a worker execution context is
> still valid after V8 API calls, but this is no longer necessary thanks to
> graceful shutdown mechanism for WorkerThread (https://crbug.com/487050)
>
> BUG=614272, 638877
>
> Committed: https://crrev.com/53752ac68bbd8b93650a9475c9b5b5f2e13a8e9a
> Cr-Commit-Position: refs/heads/master@{#413420}

TBR=yhirano@chromium.org,haraken@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=614272, 638877

Committed: https://crrev.com/360cedf2865c54108fa97f246737454ff68fc9ad
Cr-Commit-Position: refs/heads/master@{#414062}
==========

[commit-bot: I haz the power, 2016-08-24 13:33:00]

Patchset 1 (id:??) landed as
https://crrev.com/360cedf2865c54108fa97f246737454ff68fc9ad
Cr-Commit-Position: refs/heads/master@{#414062}