OOBE EULA: Override fonts on the page.

Bug: 1057957
Change-Id: I782b98b4703d585eec99eb06fb1ea8a9f3dfb9b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102540Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755437}

chrome/browser/resources/chromeos/login/oobe_screen_eula.js

@@ -19,6 +19,16 @@ login.createScreen('EulaScreen', 'eula', function() {
         '}'
   };
 
+  const EULA_FONTS_CSS = {
+    code: `body * {
+          font-family: Roboto, sans-serif !important;
+          font-size: 13px !important;
+          line-height: 20px !important;}
+         body h2 {
+           font-size: 15px !important;
+           line-height: 22px !important;}`
+  };
+
   /**
    * Timeout to load online Eula.
    * @type {number}
@@ -74,6 +84,9 @@ login.createScreen('EulaScreen', 'eula', function() {
           webview.executeScript(CLEAR_ANCHORS_CONTENT_SCRIPT);
         });
       }
+      webview.addEventListener('contentload', () => {
+        webview.insertCSS(EULA_FONTS_CSS);
+      });
 
       // Monitor webRequests API events
       this.webview_.request.onCompleted.addListener(