Removes some dead code

This isn't going to be used, so nuking.

BUG=none
TEST=none
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/99133026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241345 0039d316-1c4b-4281-b951-d872f2087c98
Update expected manifest in unittest.

CreateVisualElementsManifestTest.VisualElementsManifestCreated was
failing because it wasn't updated when the bg color was changed in
r153337.

BUG=153829
NOTRY=true

Review URL: https://codereview.chromium.org/115733003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241346 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241346