Revert 230138 "Delay wallpaper load by 2 * average wallpaper loa..."
Reason: regression on zgb/alex/mario resulting in login UI being invisible in certain cases. See http://crbug.com/313019
> Delay wallpaper load by 2 * average wallpaper load time.
>
> BUG=279102,313019
>
> TEST=manual
>
> Review URL: https://codereview.chromium.org/
24625003
TBR=alemate@chromium.org
Review URL: https://codereview.chromium.org/
54173004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232202 0039d316-1c4b-4281-b951-d872f2087c98