chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc

Index: ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc
diff --git a/ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc b/ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc
index b0355d55f400f6144265798d087802aa4ef1c52b..a902e92167e7ac6825adef902c82ac4d82cee6cc 100644
--- a/ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc
+++ b/ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc
@@ -159,8 +159,6 @@ TEST_F(TrayRotationLockTest, TrayViewVisibilityChangesDuringMaximizeMode) {
 // 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(
@@ -206,8 +204,6 @@ TEST_F(TrayRotationLockTest, DefaultViewVisibilityChangesDuringMaximizeMode) {
 // 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();