Renaming virtual setters/getters in UserManager.

Renaming virtual setters/getters in UserManager.
Follow up CL for http://codereview.chromium.org/9348022/

* Renamed unix_hacker to CamelStyle methods from UserManager as they are not non-virtual getters and setters any more.
  - user_is_logged_in()
  - logged_in_user()
  - current_user_is_owner() / set_current_user_is_owner()
  - current_user_is_new()
  - downloaded_profile_image()

BUG=None
TEST=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=125230

[Nikita (slow), 2012-02-21 10:53:09]

Please take a look. This CL only contains mass rename.
I'll merge with http://codereview.chromium.org/9348022/ once it is committed.

[Nikita (slow), 2012-02-21 11:37:23]

Trybots: 

http://build.chromium.org/p/tryserver.chromium/builders/linux_chromeos/builds...
http://build.chromium.org/p/tryserver.chromium/builders/linux_chromeos_clang/...

[Ivan Korotkov, 2012-02-21 16:55:13]

LGTM with: 
*) LoggedInUser should be GetLoggedInUser (otherwise it contains no verb).
*) IsUserLoggedIn/IsCurrentUserOwner is preferred to UserIsLoggedIn, etc.

[Nikita (slow), 2012-02-22 10:47:25]

On 2012/02/21 16:55:13, Ivan Korotkov wrote:
> LGTM with: 
> *) LoggedInUser should be GetLoggedInUser (otherwise it contains no verb).
> *) IsUserLoggedIn/IsCurrentUserOwner is preferred to UserIsLoggedIn, etc.

I'll update these and commit this CL after
http://codereview.chromium.org/9348022/ is committed.