Remove kOzoneTestSingleOverlaySupport.

ui/ozone/platform/drm/host/drm_overlay_manager.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 "ui/ozone/platform/drm/host/drm_overlay_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 11 matching lines @@
     OverlaySurfaceCandidateList;
 typedef OverlayCandidatesOzone::OverlaySurfaceCandidate OverlaySurfaceCandidate;
 
 namespace {
 const size_t kMaxCacheSize = 200;
 }  // namespace
 
 DrmOverlayManager::DrmOverlayManager(GpuThreadAdapter* proxy,
                                      DrmWindowHostManager* window_manager)
     : proxy_(proxy), window_manager_(window_manager), cache_(kMaxCacheSize) {
-  is_supported_ = base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kOzoneTestSingleOverlaySupport);
   proxy_->RegisterHandlerForDrmOverlayManager(this);
 }
 
 DrmOverlayManager::~DrmOverlayManager() {
   proxy_->UnRegisterHandlerForDrmOverlayManager();
 }
 
 std::unique_ptr<OverlayCandidatesOzone>
 DrmOverlayManager::CreateOverlayCandidates(gfx::AcceleratedWidget w) {
-  if (!is_supported_)
-    return nullptr;
   return base::WrapUnique(new DrmOverlayCandidatesHost(this, w));
 }
 
 void DrmOverlayManager::CheckOverlaySupport(
     OverlayCandidatesOzone::OverlaySurfaceCandidateList* candidates,
     gfx::AcceleratedWidget widget) {
   std::vector<OverlayCheck_Params> overlay_params;
   for (auto& candidate : *candidates) {
     // Reject candidates that don't fall on a pixel boundary.
     if (!gfx::IsNearestRectWithinDistance(candidate.display_rect, 0.01f)) {
@@ skipping 92 matching lines @@
   }
 
   if (candidate.is_clipped &&
       !candidate.clip_rect.Contains(candidate.quad_rect_in_target_space))
     return false;
 
   return true;
 }
 
 }  // namespace ui