Use default wallpaper when user wallpaper info points to empty file path.
commit98a28aaa8a734d4331b2cb8e8c2be0e389096b0b
authoralemate@chromium.org <alemate@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Tue, 3 Jun 2014 00:06:22 +0000 (3 00:06 +0000)
committeralemate@chromium.org <alemate@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Tue, 3 Jun 2014 00:06:22 +0000 (3 00:06 +0000)
tree4accd8670125b952e2dfff37c0b3900f3407ffa6
parente5b1e4374fcb2c4123e5630174873172c0cf6aab
Use default wallpaper when user wallpaper info points to empty file path.

In tests user wallpaper info can point to empty paths.
Use default wallpaper in this case.

BUG=371295
TEST=none

Review URL: https://codereview.chromium.org/309643008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274383 0039d316-1c4b-4281-b951-d872f2087c98
chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.cc