Do not bundle Roboto on CrOS

ui/webui/resources/webui_resources.grd

Index: ui/webui/resources/webui_resources.grd
diff --git a/ui/webui/resources/webui_resources.grd b/ui/webui/resources/webui_resources.grd
index 6ce564c2493ce81d7f378aec568699c06bb3ba67..71f75ed89a94df95f07aab38259a740ee1306746 100644
--- a/ui/webui/resources/webui_resources.grd
+++ b/ui/webui/resources/webui_resources.grd
@@ -17,8 +17,9 @@ without changes to the corresponding grd file. -->
       <include name="IDR_WEBUI_JSTEMPLATE_JS" file="js/jstemplate_compiled.js" flattenhtml="true" type="BINDATA" />
       <include name="IDR_WEBUI_ANALYTICS_JS" file="js/analytics.js" flattenhtml="true" type="BINDATA" />
       <!-- Roboto Font. Roboto-Regular and Roboto-Light is already available on
-           Android, and Roboto-Medium is not used on Android. -->
-      <if expr="not android">
+           Android, and Roboto-Medium is not used on Android. All 6 weights of
+           Roboto are available on Chrome OS.-->
+      <if expr="not android and not chromeos">
         <include name="IDR_WEBUI_ROBOTO_ROBOTO_REGULAR_WOFF2" file="roboto/roboto-regular.woff2" type="BINDATA" />
         <include name="IDR_WEBUI_ROBOTO_ROBOTO_MEDIUM_WOFF2" file="roboto/roboto-medium.woff2" type="BINDATA" />
         <include name="IDR_WEBUI_ROBOTO_ROBOTO_BOLD_WOFF2" file="roboto/roboto-bold.woff2" type="BINDATA" />
@@ -240,7 +241,7 @@ without changes to the corresponding grd file. -->
       <structure name="IDR_WEBUI_CSS_OVERLAY"
                  file="css/overlay.css" type="chrome_html"
                  flattenhtml="true" />
-      <structure name="IDR_WEBUI_CSS_ROBOTO"
+      <structure name="IDR_WEBUI_CSS_ROBOTO" preprocess="true"
                  file="css/roboto.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_SPINNER"
                  file="css/spinner.css" type="chrome_html"