[MD settings] display message about secondary install in default browser settings

chrome/test/data/webui/settings/cr_settings_browsertest.js

Index: chrome/test/data/webui/settings/cr_settings_browsertest.js
diff --git a/chrome/test/data/webui/settings/cr_settings_browsertest.js b/chrome/test/data/webui/settings/cr_settings_browsertest.js
index 2f5ea0ca4e01a4c951a32d6130ef7b4a16e41a24..b8a8256829173b8d991b9a186bb6f3f0402279ca 100644
--- a/chrome/test/data/webui/settings/cr_settings_browsertest.js
+++ b/chrome/test/data/webui/settings/cr_settings_browsertest.js
@@ -341,6 +341,32 @@ TEST_F('CrSettingsAppearancePageTest', 'AppearancePage', function() {
 });
 
 /**
+ * Test fixture for chrome/browser/resources/settings/default_browser_page/.
+ * @constructor
+ * @extends {CrSettingsBrowserTest}
+*/
+function CrSettingsDefaultBrowserTest() {}
+
+CrSettingsDefaultBrowserTest.prototype = {
+  __proto__: CrSettingsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload:
+      'chrome://md-settings/default_browser_page/default_browser_page.html',
+
+  /** @override */
+  extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
+    'test_browser_proxy.js',
+    'default_browser_browsertest.js',
+  ]),
+};
+
+TEST_F('CrSettingsDefaultBrowserTest', 'DefaultBrowserPage', function() {
+  settings_default_browser.registerTests();
+  mocha.run();
+});
+
+/**
  * Test fixture for chrome/browser/resources/settings/search_page/.
  * @constructor
  * @extends {CrSettingsBrowserTest}