chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc

Index: ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
diff --git a/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc b/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
index 0279a436fcc35d32b2a4346036fa61cba0b0947e..1943640c6aad9e585dd6ef3936e461055b5e2868 100644
--- a/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
+++ b/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
@@ -32,9 +32,6 @@ class KeyboardOverlayDelegateTest
 
 // Verifies we can show and close the widget for the overlay dialog.
 TEST_P(KeyboardOverlayDelegateTest, ShowAndClose) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("500x400,300x200");
   GetPrimaryShelf()->SetAlignment(shelf_alignment());
   KeyboardOverlayDelegate delegate(base::ASCIIToUTF16("Title"),