chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/mus/test/wm_test_base.h

 // 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.
 
 #ifndef ASH_MUS_TEST_WM_TEST_BASE_H_
 #define ASH_MUS_TEST_WM_TEST_BASE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 26 matching lines @@
 class WmTestHelper;
 
 // Base class for window manager tests that want to configure
 // WindowTreeClient without a client to mus.
 // TODO(sky): nuke this.
 class WmTestBase : public testing::Test {
  public:
   WmTestBase();
   ~WmTestBase() override;
 
-  // TODO(sky): temporary until http://crbug.com/611563 is fixed.
-  bool SupportsMultipleDisplays() const;
-
   // Update the display configuration as given in |display_spec|.
   // See test::DisplayManagerTestApi::UpdateDisplay for more details.
   void UpdateDisplay(const std::string& display_spec);
 
   aura::Window* GetPrimaryRootWindow();
   aura::Window* GetSecondaryRootWindow();
 
   display::Display GetPrimaryDisplay();
   display::Display GetSecondaryDisplay();
 
@@ skipping 32 matching lines @@
   std::unique_ptr<WmWindowTestApi::GlobalMinimumSizeLock> minimum_size_lock_;
   std::unique_ptr<WmTestHelper> test_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(WmTestBase);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_TEST_WM_TEST_BASE_H_