Fix experimental bookmark extension image assets

Original images comitted in r226314 were corrupted in the commit queue.

BUG=311282
R=estade@chromium.org

Review URL: https://codereview.chromium.org/58613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232843 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232843
Add icon for Now component extension (to appear in Notification settings dialog)

BUG=229653
R=dgozman@chromium.org, robliao@chromium.org, vadimt@chromium.org

Review URL: https://codereview.chromium.org/56643002

Patch from Travis Skare <skare@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232844 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232844