Incognito NTP style tweaks

ui/webui/resources/css/roboto.css

Index: ui/webui/resources/css/roboto.css
diff --git a/ui/webui/resources/css/roboto.css b/ui/webui/resources/css/roboto.css
index 34c0ad7bca1687cae0159986b1a945ef00d68138..c9554f23d38e600549fd7a246f5348ac55807f25 100644
--- a/ui/webui/resources/css/roboto.css
+++ b/ui/webui/resources/css/roboto.css
@@ -5,6 +5,14 @@
 @font-face {
   font-family: 'Roboto';
   font-style: normal;
+  font-weight: 300;
+  src: local('Roboto Light'), local('Roboto-Light'),
+      url(chrome://resources/roboto/roboto-light.woff2) format('woff2');

[Dan Beam, 2016/01/12 23:05:52]

this will probably piss off some bots (it's gonna make chrome bigger)

[edwardjung, 2016/01/13 21:24:07]

What's the procedure for getting this through? Anything I can do before
committing.

[Dan Beam, 2016/01/13 21:51:41]

not sure.  maybe it wont trip the bots?  but you could pre-check with perf
sheriffs or TPMs regarding a sizes increase, but they're gonna argue their
hardest to convince you it's not necessary.  you'd need ammo to convince them it
is.

+}
+
+@font-face {
+  font-family: 'Roboto';
+  font-style: normal;
   font-weight: 400;
   src: local('Roboto'), local('Roboto-Regular'),
       url(chrome://resources/roboto/roboto-regular.woff2) format('woff2');