chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/workspace/workspace_window_resizer_unittest.cc

Index: ash/wm/workspace/workspace_window_resizer_unittest.cc
diff --git a/ash/wm/workspace/workspace_window_resizer_unittest.cc b/ash/wm/workspace/workspace_window_resizer_unittest.cc
index 5cb6db0ed662c95abe879a6ce5743bee09afe472..fd7d30b17e197cddb8bbdbc44a65501691b44de8 100644
--- a/ash/wm/workspace/workspace_window_resizer_unittest.cc
+++ b/ash/wm/workspace/workspace_window_resizer_unittest.cc
@@ -586,13 +586,10 @@ TEST_P(WorkspaceWindowResizerTest, Edge) {
               window_state->GetRestoreBoundsInScreen().ToString());
   }
 
-  // Test if the restore bounds is correct in multiple displays.
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Restore the window to clear snapped state.
   window_state->Restore();
 
+  // Test if the restore bounds is correct in multiple displays.
   UpdateDisplay("800x600,500x600");
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   EXPECT_EQ(root_windows[0], window_->GetRootWindow());
@@ -635,9 +632,6 @@ TEST_P(WorkspaceWindowResizerTest, NonResizableWindows) {
 }
 
 TEST_P(WorkspaceWindowResizerTest, CancelSnapPhantom) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("800x600,800x600");
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   ASSERT_EQ(2U, root_windows.size());
@@ -810,9 +804,6 @@ TEST_P(WorkspaceWindowResizerTest, DontDragOffBottom) {
 
 // Makes sure we don't allow dragging on the work area with multidisplay.
 TEST_P(WorkspaceWindowResizerTest, DontDragOffBottomWithMultiDisplay) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("800x600,800x600");
   ASSERT_EQ(2, display::Screen::GetScreen()->GetNumDisplays());
 
@@ -977,9 +968,6 @@ TEST_P(WorkspaceWindowResizerTest, DragWindowOutsideRightToSecondaryDisplay) {
                 base::IntToString(window_width) + "x380",
             window_->bounds().ToString());
 
-  if (!SupportsMultipleDisplays())
-    return;
-
   // With secondary display.  Operation itself is same but doesn't change
   // the position because the window is still within the secondary display.
   UpdateDisplay("1000x600,600x400");