WebUI: Show focus outline when editing tree item on Mac
WebUI: Show focus outline when editing tree item on Mac

BUG=None
TEST=Go to bookmarks manager on a Mac.
     Rename a tree item.
     The text input should show the outline.

Review URL: http://codereview.chromium.org/6529038

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@75167 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser