chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc

 // Copyright 2014 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 "ash/system/chromeos/rotation/tray_rotation_lock.h"
 
 #include <memory>
 
 #include "ash/common/system/status_area_widget.h"
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 141 matching lines @@
       true);
   EXPECT_TRUE(tray_view()->visible());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       false);
   EXPECT_FALSE(tray_view()->visible());
 }
 
 // Tests that the when the tray view is created for a secondary display, that
 // it is not visible, and that MaximizeMode does not affect visibility.
 TEST_F(TrayRotationLockTest, CreateSecondaryTrayView) {
-  if (!SupportsMultipleDisplays())
-    return;
   UpdateDisplay("400x400,200x200");
 
   SetUpForStatusAreaWidget(
       StatusAreaWidgetTestHelper::GetSecondaryStatusAreaWidget());
   EXPECT_FALSE(tray_view()->visible());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       true);
   EXPECT_FALSE(tray_view()->visible());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       false);
@@ skipping 25 matching lines @@
       true);
   EXPECT_TRUE(default_view()->visible());
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       false);
   EXPECT_FALSE(default_view()->visible());
 }
 
 // Tests that no default view is created when the target is a secondary
 // display.
 TEST_F(TrayRotationLockTest, CreateSecondaryDefaultView) {
-  if (!SupportsMultipleDisplays())
-    return;
   UpdateDisplay("400x400,200x200");
 
   TearDownViews();
   SetUpForStatusAreaWidget(
       StatusAreaWidgetTestHelper::GetSecondaryStatusAreaWidget());
   EXPECT_EQ(NULL, default_view());
 }
 
 // Tests that activating the default view causes the display to have its
 // rotation locked, and that the tray view becomes visible.
@@ skipping 41 matching lines @@
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       true);
   DestroyTrayView();
   Shell::GetInstance()->screen_orientation_controller()->SetRotationLocked(
       true);
   WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
       false);
 }
 
 }  // namespace ash