chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/video_detector_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/wm/video_detector.h"
 
 #include <deque>
 #include <memory>
 
 #include "ash/common/wm/window_state.h"
@@ skipping 234 matching lines @@
   while (now_ < start_time + 2 * kMinDuration) {
     detector_->OnDelegatedFrameDamage(window1.get(), kMinRect);
     detector_->OnDelegatedFrameDamage(window2.get(), kMinRect);
     AdvanceTime(time_between_updates);
   }
   EXPECT_EQ(VideoDetector::State::PLAYING_WINDOWED, observer_->PopState());
   EXPECT_TRUE(observer_->empty());
 }
 
 TEST_F(VideoDetectorTest, ReportFullscreen) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("1024x768,1024x768");
 
   std::unique_ptr<aura::Window> window =
       CreateTestWindow(gfx::Rect(0, 0, 1024, 768));
   wm::WindowState* window_state = wm::GetWindowState(window.get());
   const wm::WMEvent toggle_fullscreen_event(wm::WM_EVENT_TOGGLE_FULLSCREEN);
   window_state->OnWMEvent(&toggle_fullscreen_event);
   ASSERT_TRUE(window_state->IsFullscreen());
   window->Focus();
   SendUpdates(window.get(), kMinRect, 2 * kMinFps, 2 * kMinDuration);
@@ skipping 24 matching lines @@
   // immediately notified about windowed video.
   observer_->reset();
   other_window_state->OnWMEvent(&toggle_fullscreen_event);
   ASSERT_FALSE(other_window_state->IsFullscreen());
   EXPECT_EQ(VideoDetector::State::PLAYING_WINDOWED, observer_->PopState());
   EXPECT_TRUE(observer_->empty());
 }
 
 }  // namespace test
 }  // namespace ash