Remove all references from WebWorkerPermissionClientProxy in Blink.

Remove all references from WebWorkerPermissionClientProxy in Blink.

This include all the code that was there for Chromium to be able to
build.

This is part of a series of three CLs:
1. https://codereview.chromium.org/968163003
2. https://codereview.chromium.org/968983002
3. <this>

BUG=462255
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191584

[mlamouri (slow - plz ping), 2015-03-02 15:24:18]

mlamouri@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-03-03 13:40:31]

lgtm

[mlamouri (slow - plz ping), 2015-03-09 20:09:12]

The CQ bit was checked by mlamouri@chromium.org

[mlamouri (slow - plz ping), 2015-03-09 20:09:13]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/968203002/#ps20001 (title:
"rebase")

[commit-bot: I haz the power, 2015-03-09 20:10:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/968203002/20001

[commit-bot: I haz the power, 2015-03-09 22:03:38]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=191584