Decommit unused system pages when invoking WTF::DecommitSystemPages().

Decommit unused system pages when invoking WTF::DecommitSystemPages().

BUG=

Review-Url: https://codereview.chromium.org/2935443002
Cr-Commit-Position: refs/heads/master@{#478259}
Committed: https://chromium.googlesource.com/chromium/src/+/fec0e7c106a1b36f0e2989a116b820a70c1d56bb

[tasak, 2017-06-09 10:15:45]

The CQ bit was checked by tasak@google.com to run a CQ dry run

[commit-bot: I haz the power, 2017-06-09 10:15:52]

Dry run: CQ is trying da patch.

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

[tasak, 2017-06-09 11:21:57]

tasak@google.com changed reviewers:
+ ajwong@chromium.org, bashi@chromium.org, haraken@chromium.org

[tasak, 2017-06-09 11:21:57]

Would you review this CL?

[commit-bot: I haz the power, 2017-06-09 11:46:53]

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

[commit-bot: I haz the power, 2017-06-09 11:46:54]

Dry run: This issue passed the CQ dry run.

[haraken, 2017-06-09 13:15:13]

LGTM

[haraken, 2017-06-09 13:15:17]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2017-06-09 13:15:25]

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, 2017-06-09 13:19:58]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1497014117473500, "parent_rev":
"eafb0c0e989e157fb1ea1c90fde8157f37cc27c9", "commit_rev":
"fec0e7c106a1b36f0e2989a116b820a70c1d56bb"}

[commit-bot: I haz the power, 2017-06-09 13:20:10]

Description was changed from

==========
Decommit unused system pages when invoking WTF::DecommitSystemPages().

BUG=
==========

to

==========
Decommit unused system pages when invoking WTF::DecommitSystemPages().

BUG=

Review-Url: https://codereview.chromium.org/2935443002
Cr-Commit-Position: refs/heads/master@{#478259}
Committed:
https://chromium.googlesource.com/chromium/src/+/fec0e7c106a1b36f0e2989a116b8...
==========

[commit-bot: I haz the power, 2017-06-09 13:20:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/fec0e7c106a1b36f0e2989a116b8...

[awong, 2017-06-12 20:48:11]

Eek. Too late now as it's committed, but FYI, this is NOT DecommitSystemPages()
at all.  That was the confusion in the first place.

You ended up "discarding" on windows for the windows definition of discarding
which is NOT a decommit.