Revert of Rename PrivateMode enum values:

Revert of Rename PrivateMode enum values: (https://codereview.chromium.org/215023002/)

Reason for revert:
Broke build.

http://build.chromium.org/p/chromium.linux/builders/Linux%20Builder%20%28dbg%29/builds/71042/steps/compile/logs/stdio#error1

Original issue's description:
> Rename PrivateMode enum values:
> 
> kPrivacyModeDisabled => PRIVACY_MODE_DISABLED
> kPrivacyModeEnabled  => PRIVACY_MODE_ENABLED
> 
> To match the chromium style guide:
> 
> Though the Google C++ Style Guide now says to use kConstantNaming for enums,
> Chromium was written using MACRO_STYLE naming.  Continue to use this style for consistency.
> 
> R=mef@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260281

TBR=mef@chromium.org,zea@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260296

[Ryan Hamilton, 2014-03-28 22:08:27]

Created Revert of Rename PrivateMode enum values:

[commit-bot: I haz the power, 2014-03-28 22:09:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rch@chromium.org/217053010/1

[commit-bot: I haz the power, 2014-03-28 22:12:51]

Change committed as 260296