Revert of [runtime] temporarily transform IsContext check from DHECK to CHECK

Revert of [runtime] temporarily transform IsContext check from DHECK to CHECK (patchset #2 id:20001 of https://codereview.chromium.org/2164633002/ )

Reason for revert:
There have been no more occurrences of this on dev / beta so we can convert the CHECK back to DCHECK.

Original issue's description:
> [runtime] temporarily transform IsContext check from DCHECK to CHECK
>
> We are enabling this trial on canary to see if we can flush out some missing
> context restores.
>
> BUG=
>
> Committed: https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
> Cr-Commit-Position: refs/heads/master@{#37875}

TBR=jkummerow@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/6faf6c1545f71ee8b394f0bb785a41017e804955
Cr-Commit-Position: refs/heads/master@{#39292}

[Camillo Bruni, 2016-09-01 12:30:36]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2016-09-01 12:30:37]

Created Revert of [runtime] temporarily transform IsContext check from DHECK to
CHECK

[commit-bot: I haz the power, 2016-09-01 12:30:44]

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, 2016-09-01 12:32:08]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-01 12:32:09]

Try jobs failed on following builders:
  v8_android_arm_compile_rel on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_android_arm_compile_rel/...)
  v8_linux64_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel_ng/builds/11959)
  v8_linux_arm64_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel_ng/build...)
  v8_linux_gcc_compile_rel on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_gcc_compile_rel/bu...)
  v8_linux_mips64el_compile_rel on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mips64el_compile_r...)
  v8_linux_mipsel_compile_rel on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel...)

[Camillo Bruni, 2016-09-08 17:59:55]

The CQ bit was checked by cbruni@chromium.org

[commit-bot: I haz the power, 2016-09-08 18:00:03]

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, 2016-09-08 18:28:06]

Committed patchset #2 (id:70001)

[commit-bot: I haz the power, 2016-09-08 18:28:28]

Description was changed from

==========
Revert of [runtime] temporarily transform IsContext check from DHECK to CHECK
(patchset #2 id:20001 of https://codereview.chromium.org/2164633002/ )

Reason for revert:
There have been no more occurrences of this on dev / beta so we can convert the
CHECK back to DCHECK.

Original issue's description:
> [runtime] temporarily transform IsContext check from DCHECK to CHECK
> 
> We are enabling this trial on canary to see if we can flush out some missing
> context restores.
> 
> BUG=
> 
> Committed: https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
> Cr-Commit-Position: refs/heads/master@{#37875}

TBR=jkummerow@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
==========

to

==========
Revert of [runtime] temporarily transform IsContext check from DHECK to CHECK
(patchset #2 id:20001 of https://codereview.chromium.org/2164633002/ )

Reason for revert:
There have been no more occurrences of this on dev / beta so we can convert the
CHECK back to DCHECK.

Original issue's description:
> [runtime] temporarily transform IsContext check from DCHECK to CHECK
>
> We are enabling this trial on canary to see if we can flush out some missing
> context restores.
>
> BUG=
>
> Committed: https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
> Cr-Commit-Position: refs/heads/master@{#37875}

TBR=jkummerow@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/6faf6c1545f71ee8b394f0bb785a41017e804955
Cr-Commit-Position: refs/heads/master@{#39292}
==========

[commit-bot: I haz the power, 2016-09-08 18:28:29]

Patchset 2 (id:??) landed as
https://crrev.com/6faf6c1545f71ee8b394f0bb785a41017e804955
Cr-Commit-Position: refs/heads/master@{#39292}