Refactor the "Learn more" DNS infobar shown on startup
Refactor the "Learn more" DNS infobar shown on startup

It now displays a link instead of a button for the "Learn more" action.

I intend to reuse this for the "Your OS is obsolete" infobar.

BUG=79401

Review URL: http://codereview.chromium.org/7047012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@85946 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium