Revert of Rename WorkerPermissionClient and friends to WorkerContentSettingsClient.

Revert of Rename WorkerPermissionClient and friends to WorkerContentSettingsClient. (patchset #1 id:1 of https://codereview.chromium.org/968163003/)

Reason for revert:
Likely causing browser_test crashes

See: http://build.chromium.org/p/chromium.webkit/builders/Linux%20Tests/builds/42911/steps/browser_tests/logs/WebViewTest.FileSystemAPIRequestFromWorkerDeny

../../chrome/browser/apps/guest_view/web_view_browsertest.cc:621: Failure
Value of: done_listener.WaitUntilSatisfied()
  Actual: false
Expected: true

Original issue's description:
> Rename WorkerPermissionClient and friends to WorkerContentSettingsClient.
> 
> This CL is keeping WebWorkerPermissionClient and its proxy alive to prevent
> Chromium build to break.
> 
> This is part of a suite of three CLs:
> 1. <this>
> 2. https://codereview.chromium.org/968983002
> 3. https://codereview.chromium.org/968203002
> 
> BUG=462255
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191193

TBR=jochen@chromium.org,mlamouri@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=462255
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191203

[enne (OOO), 2015-03-03 18:06:21]

Created Revert of Rename WorkerPermissionClient and friends to
WorkerContentSettingsClient.

[commit-bot: I haz the power, 2015-03-03 18:07:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/973103003/1

[commit-bot: I haz the power, 2015-03-03 18:08:31]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=191203