arc: Use overlay to show links from ToS.

chrome/browser/resources/chromeos/arc_support/main.css

Index: chrome/browser/resources/chromeos/arc_support/main.css
diff --git a/chrome/browser/resources/chromeos/arc_support/main.css b/chrome/browser/resources/chromeos/arc_support/main.css
index a7704c905c99c0f38052eba7e2da7e3f6eb25723..e2226bec711a86ada746a79041da05bfdd18d7b7 100644
--- a/chrome/browser/resources/chromeos/arc_support/main.css
+++ b/chrome/browser/resources/chromeos/arc_support/main.css
@@ -87,11 +87,34 @@ webview,
   width: 960px;
 }
 
+.overlay-text .page {
+  width: 480px;
+}
+
+.overlay-text webview {
+  display: none;
+}
+
+.overlay-url .page {
+  width: 640px;
+}
+
+.overlay-url span {
+  display: none;
+}
+
+.overlay-url webview {
+  display: block;
+  height: 300px;
+  margin: 24px 8px 8px 8px;
+  padding: 0;
+  width: 100%;
+}
+
 .page {
   font-family: 'Roboto';
   font-size: 13px;
   text-align: left;
-  width: 480px;
 }
 
 .scrollable {