Migrate md history test code to ScopedFeatureList.

chrome/browser/ui/find_bar/find_bar_host_browsertest.cc

Index: chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
diff --git a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
index cdfdc95831083cd69e4fb37ec7e39bbaf72a8c49..27e34043f8ff2dead8ce8ba2338324c9a507d68c 100644
--- a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
+++ b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
@@ -11,6 +11,7 @@
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_feature_list.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/history/history_service_factory.h"
@@ -28,6 +29,7 @@
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/md_history_ui.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/find_in_page_observer.h"
@@ -313,7 +315,8 @@ IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindInPageFormsTextAreas) {
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, MAYBE_SearchWithinSpecialURL) {
   // TODO(tsergeant): Get this test working on MD History, which loads very
   // asynchronously and causes this test to fail.
-  MdHistoryUI::SetEnabledForTesting(false);
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitAndDisableFeature(features::kMaterialDesignHistory);
 
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();