Previously under resources/contextual_search/, now moving Roboto to its own directory. Also using Roboto2 now.

BUG=401100
R=dbeam@chromium.org, huangs@chromium.org
TBR=jam
TEST=Didn't break Contextual Search promo

Review URL: https://codereview.chromium.org/450433002

Cr-Commit-Position: refs/heads/master@{#288386}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288386 0039d316-1c4b-4281-b951-d872f2087c98