chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/shelf/shelf_widget_unittest.cc

Index: ash/shelf/shelf_widget_unittest.cc
diff --git a/ash/shelf/shelf_widget_unittest.cc b/ash/shelf/shelf_widget_unittest.cc
index dc1430a5850b04e2bcbbe8fe04ba898ce15637de..a2330e3c27ba428a66c111bb5ccbd146b1c5556c 100644
--- a/ash/shelf/shelf_widget_unittest.cc
+++ b/ash/shelf/shelf_widget_unittest.cc
@@ -88,9 +88,6 @@ TEST_P(ShelfWidgetTest, TestAlignment) {
 }
 
 TEST_P(ShelfWidgetTest, TestAlignmentForMultipleDisplays) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Note that for a left- and right-aligned shelf, this offset must be
   // applied to a maximized window's width rather than its height.
   const int offset = GetMdMaximizedWindowHeightOffset();
@@ -169,9 +166,6 @@ TEST_P(ShelfWidgetTest, DontReferenceShelfAfterDeletion) {
 // container and status widget has finished sizing.
 // See http://crbug.com/252533
 TEST_P(ShelfWidgetTest, ShelfInitiallySizedAfterLogin) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   SetUserLoggedIn(false);
   UpdateDisplay("300x200,400x300");