Update WebUI for HiDPI images added in r143476

BUG=132910
TEST=Top left icon on about:crashes, about:plugins and folder
icon on about:bookmarks (on mac) look sharp.
TBR=jhawkins

Review URL: https://chromiumcodereview.appspot.com/10638011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@143588 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed