[MD settings] Show up to six on startup urls without scrolling

chrome/browser/resources/settings/on_startup_page/startup_urls_page.html

Index: chrome/browser/resources/settings/on_startup_page/startup_urls_page.html
diff --git a/chrome/browser/resources/settings/on_startup_page/startup_urls_page.html b/chrome/browser/resources/settings/on_startup_page/startup_urls_page.html
index d51298f5d21d5e546ed489081ae57babad3bcb3f..462c8a839cdaa2e0a3ea5bca93ec8f2a6f79658c 100644
--- a/chrome/browser/resources/settings/on_startup_page/startup_urls_page.html
+++ b/chrome/browser/resources/settings/on_startup_page/startup_urls_page.html
@@ -12,7 +12,7 @@
     <style include="settings-shared">
       #outer {
         @apply(--settings-list-frame-padding);
-        max-height: 300px;
+        max-height: 395px;  /** Enough height to show six entries. */
       }
       #container iron-list > settings-startup-url-entry:not(:first-of-type) {
         border-top: var(--settings-separator-line);