Convert --enable-md-history to a feature flag.

chrome/browser/ui/webui/uber/uber_ui_browsertest.cc

Index: chrome/browser/ui/webui/uber/uber_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/uber/uber_ui_browsertest.cc b/chrome/browser/ui/webui/uber/uber_ui_browsertest.cc
index 14bc2c7f76d4da911f79f644d36dfbb40d222bc2..ae1de022ec0f8c292c419b7ad18068504ae3d157 100644
--- a/chrome/browser/ui/webui/uber/uber_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/uber/uber_ui_browsertest.cc
@@ -16,6 +16,7 @@
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/base/web_ui_browser_test.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
@@ -44,6 +45,12 @@ class UberUIBrowserTest : public WebUIBrowserTest {
           "uber.invokeMethodOnWindow(this, 'changeSelection', data);");
   }
 
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitchASCII(
+      ::switches::kEnableFeatures,
+      ::switches::kMaterialDesignHistoryFeature.name);
+  }
+
  private:
   content::WebContents* GetWebContents() {
     return browser()->tab_strip_model()->GetActiveWebContents();
@@ -92,8 +99,6 @@ IN_PROC_BROWSER_TEST_F(UberUIBrowserTest, EnableMdExtensionsHidesExtensions) {
 }
 
 IN_PROC_BROWSER_TEST_F(UberUIBrowserTest, EnableMdHistoryHidesHistory) {
-  base::CommandLine::ForCurrentProcess()->AppendSwitch(
-    ::switches::kEnableMaterialDesignHistory);
   ui_test_utils::NavigateToURL(browser(), GURL(chrome::kChromeUIUberFrameURL));
   SelectTab();
   EXPECT_TRUE(GetJsBool("$('history').hidden"));