Remove RenderFrameHost pointer from ChooserController.

chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc

Index: chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc
diff --git a/chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc b/chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc
index efd22b174a5639688528f978b9911e9c2b0e9c50..f63b11ca400c96095ef19366ff419fd3fa0de7c2 100644
--- a/chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc
+++ b/chrome/browser/ui/views/extensions/chooser_dialog_view_unittest.cc
@@ -30,8 +30,7 @@ class ChooserDialogViewTest : public views::ViewsTestBase {
   // views::ViewsTestBase:
   void SetUp() override {
     views::ViewsTestBase::SetUp();
-    std::unique_ptr<MockChooserController> mock_chooser_controller(
-        new MockChooserController(nullptr));
+    auto mock_chooser_controller = base::MakeUnique<MockChooserController>();
     mock_chooser_controller_ = mock_chooser_controller.get();
     std::unique_ptr<ChooserDialogView> chooser_dialog_view(
         new ChooserDialogView(std::move(mock_chooser_controller)));