Revert 128663 - Linux ChromiumOS Tester crashing in OnDesktopBackgroundChanged() from GetUserWallpaperIndex()
Revert 128663 - Linux ChromiumOS Tester crashing in OnDesktopBackgroundChanged() from GetUserWallpaperIndex()

Save the wallpaper selected for the user if was not set previsouly (first time).

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9834077

TBR=saintlou@chromium.org
Review URL: https://chromiumcodereview.appspot.com/9835080

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@128687 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium