[Resources] Move roboto.woff and add roboto.woff2 to a roboto/ directory

chrome/browser/resources/contextual_search/promo.css

Index: chrome/browser/resources/contextual_search/promo.css
diff --git a/chrome/browser/resources/contextual_search/promo.css b/chrome/browser/resources/contextual_search/promo.css
index d5c57e50a207412d8fd3ee86ac9c6c691066b538..3fd54966481cc1c3ff5175a8d37e64ea3a8bbf0c 100644
--- a/chrome/browser/resources/contextual_search/promo.css
+++ b/chrome/browser/resources/contextual_search/promo.css
@@ -3,13 +3,14 @@
    found in the LICENSE file.
 */
 @font-face {
-  font-family: 'Roboto';
+  font-family: 'Roboto2';
   font-weight: 400;
-  src: url(/roboto.woff) format('woff');
+  src: local('Roboto'), local('Roboto2-Regular'),
+      url(/roboto.woff2) format('woff2'), url(/roboto.woff) format('woff');
 }
 
 body {
-  font-family: 'Roboto';
+  font-family: 'Roboto2', sans-serif;
   font-size: 1em;
   margin: 0;
 }