Skip mulitple-dispay tests on win8

ash/shelf/shelf_layout_manager_unittest.cc

 // Copyright (c) 2012 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/shelf/shelf_layout_manager.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/ash_switches.h"
 #include "ash/display/display_manager.h"
@@ skipping 1190 matching lines @@
   RunGestureDragTests(gfx::Vector2d(0, 100));
 
   shelf->SetAlignment(SHELF_ALIGNMENT_LEFT);
   RunGestureDragTests(gfx::Vector2d(-100, 0));
 
   shelf->SetAlignment(SHELF_ALIGNMENT_RIGHT);
   RunGestureDragTests(gfx::Vector2d(100, 0));
 }
 
 TEST_F(ShelfLayoutManagerTest, WindowVisibilityDisablesAutoHide) {
+  if (!SupportsMultipleDisplays())
+    return;
+
   UpdateDisplay("800x600,800x600");
   ShelfLayoutManager* shelf = GetShelfLayoutManager();
   shelf->LayoutShelf();
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
 
   // Create a visible window so auto-hide behavior is enforced
   views::Widget* dummy = CreateTestWidget();
 
   // Window visible => auto hide behaves normally.
   shelf->UpdateVisibilityState();
@@ skipping 242 matching lines @@
       EXPECT_TRUE(status_area_widget->IsMessageBubbleShown());
     } else {
       EXPECT_FALSE(shelf->IsVisible());
       EXPECT_FALSE(status_area_widget->IsMessageBubbleShown());
     }
   }
 }
 
 }  // namespace internal
 }  // namespace ash