Fix non-component Win-Clang build of headless_shell

Fix non-component Win-Clang build of headless_shell

It was failing due to unused private member variables and an unused constant.

BUG=722048
TBR=dvallet,skyostil

Review-Url: https://codereview.chromium.org/2878253002
Cr-Commit-Position: refs/heads/master@{#471597}
Committed: https://chromium.googlesource.com/chromium/src/+/727830d6051803fe78533922089672dfb652b3ac

[hans, 2017-05-13 16:48:07]

Description was changed from

==========
Fix non-component Win-Clang build of headless_shell

It was failing due to unused private member variabes and an unused constant.

BUG=722048
==========

to

==========
Fix non-component Win-Clang build of headless_shell

It was failing due to unused private member variables and an unused constant.

BUG=722048
TBR=dvallet,skyostil
==========

[hans, 2017-05-13 16:48:07]

hans@chromium.org changed reviewers:
+ dvallet@chromium.org, skyostil@chromium.org

[hans, 2017-05-13 16:48:12]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2017-05-13 16:48:34]

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, 2017-05-13 17:33:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494694092477630, "parent_rev":
"c7068214d25dbbc88071619868ecdcadd242a4af", "commit_rev":
"727830d6051803fe78533922089672dfb652b3ac"}

[commit-bot: I haz the power, 2017-05-13 17:33:16]

Description was changed from

==========
Fix non-component Win-Clang build of headless_shell

It was failing due to unused private member variables and an unused constant.

BUG=722048
TBR=dvallet,skyostil
==========

to

==========
Fix non-component Win-Clang build of headless_shell

It was failing due to unused private member variables and an unused constant.

BUG=722048
TBR=dvallet,skyostil

Review-Url: https://codereview.chromium.org/2878253002
Cr-Commit-Position: refs/heads/master@{#471597}
Committed:
https://chromium.googlesource.com/chromium/src/+/727830d6051803fe785339220896...
==========

[commit-bot: I haz the power, 2017-05-13 17:33:18]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/727830d6051803fe785339220896...

[dvallet, 2017-05-13 21:24:37]

LGTM

Sorry that I missed this
Thanks heaps for submitting a fix!