Media Router: Remove unnecessary and incorrect static_cast in test.

chrome/browser/ui/toolbar/media_router_contextual_menu_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/signin/fake_signin_manager_builder.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/ui/toolbar/media_router_action.h"
 #include "chrome/browser/ui/toolbar/media_router_contextual_menu.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 
 class MediaRouterContextualMenuUnitTest : public BrowserWithTestWindowTest {
  public:
   MediaRouterContextualMenuUnitTest() {}
   ~MediaRouterContextualMenuUnitTest() override {}
 
   void SetUp() override {
     BrowserWithTestWindowTest::SetUp();
-    signin_manager_ = static_cast<FakeSigninManagerForTesting*>(
-        SigninManagerFactory::GetInstance()->GetForProfile(profile()));
+    signin_manager_ =
+        SigninManagerFactory::GetInstance()->GetForProfile(profile());
     browser_action_test_util_.reset(
         new BrowserActionTestUtil(browser(), false));
     action_.reset(new MediaRouterAction(browser(),
         browser_action_test_util_->GetToolbarActionsBar()));
     model_ = static_cast<ui::SimpleMenuModel*>(action_->GetContextMenu());
   }
 
   void TearDown() override {
     action_.reset();
     browser_action_test_util_.reset();
     BrowserWithTestWindowTest::TearDown();
   }
 
-  FakeSigninManagerForTesting* signin_manager() { return signin_manager_; }
+  SigninManagerBase* signin_manager() { return signin_manager_; }
   ui::SimpleMenuModel* model() { return model_; }
 
  private:
   std::unique_ptr<BrowserActionTestUtil> browser_action_test_util_;
   std::unique_ptr<MediaRouterAction> action_;
-  FakeSigninManagerForTesting* signin_manager_;
+  SigninManagerBase* signin_manager_;
   ui::SimpleMenuModel* model_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterContextualMenuUnitTest);
 };
 
 // Tests the basic state of the contextual menu.
 TEST_F(MediaRouterContextualMenuUnitTest, Basic) {
   int expected_number_items = 7;
 
 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
@@ skipping 29 matching lines @@
   signin_manager()->SetAuthenticatedAccountInfo("foo@bar.com", "password");
 
   // Run the same checks as before. All existing menu items should be now
   // enabled and visible.
   EXPECT_EQ(model()->GetItemCount(), expected_number_items);
   for (int i = 0; i < expected_number_items; i++) {
     EXPECT_TRUE(model()->IsEnabledAt(i));
     EXPECT_TRUE(model()->IsVisibleAt(i));
   }
 }