chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/common/devtools/ash_devtools_unittest.cc

 // Copyright 2016 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/common/devtools/ash_devtools_css_agent.h"
 #include "ash/common/devtools/ash_devtools_dom_agent.h"
 #include "ash/common/test/ash_test.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
@@ skipping 604 matching lines @@
   ExpectHighlighted(root_view->GetBoundsInScreen(), 0);
 
   HideHighlight(0);
 
   // Highlight non-existent node
   HighlightNode(10000);
   EXPECT_FALSE(GetHighlightingWindow(0)->IsVisible());
 }
 
 TEST_F(AshDevToolsTest, MultipleDisplayHighlight) {
-  if (!SupportsMultipleDisplays())
-    return;
   UpdateDisplay("300x400,500x500");
 
   WmWindow::Windows root_windows = WmShell::Get()->GetAllRootWindows();
   std::unique_ptr<WindowOwner> window_owner(
       CreateTestWindow(gfx::Rect(1, 2, 30, 40)));
   WmWindow* window = window_owner->window();
 
   std::unique_ptr<ui::devtools::protocol::DOM::Node> root;
   dom_agent()->getDocument(&root);
 
@@ skipping 119 matching lines @@
   EXPECT_EQ(gfx::Rect(25, 35, 45, 20), root_view->bounds());  // Not changed
 
   SetStyleTexts(root_view_node, "\nheight: 73;\n  ", true);
   EXPECT_EQ(gfx::Rect(25, 35, 45, 73), root_view->bounds());
 
   SetStyleTexts(root_view_node, "\nx: 10; y: 23; width: 52;\n  ", true);
   EXPECT_EQ(gfx::Rect(10, 23, 52, 73), root_view->bounds());
 }
 
 }  // namespace ash