Revert of Makes MaterialDesignController initialization explicit

ui/views/controls/button/label_button_unittest.cc

Index: ui/views/controls/button/label_button_unittest.cc
diff --git a/ui/views/controls/button/label_button_unittest.cc b/ui/views/controls/button/label_button_unittest.cc
index 31255a1249280d124603fc6adbdedd592e077372..d5b60451e9fbee270febacb374edecc3b6a2edcb 100644
--- a/ui/views/controls/button/label_button_unittest.cc
+++ b/ui/views/controls/button/label_button_unittest.cc
@@ -4,14 +4,12 @@
 
 #include "ui/views/controls/button/label_button.h"
 
-#include "base/command_line.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/test/material_design_controller_test_api.h"
-#include "ui/base/ui_base_switches.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
@@ -360,8 +358,9 @@
 
   // ViewsTestBase:
   void SetUp() override {
-    base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
-        switches::kTopChromeMD, switches::kTopChromeMDMaterial);
+    ui::test::MaterialDesignControllerTestAPI::SetMode(
+        ui::MaterialDesignController::MATERIAL_NORMAL);
+
     ViewsTestBase::SetUp();
 
     // Create a widget so that the CustomButton can query the hover state