Mac color: Apply Sierra workaround unconditionally

ui/accelerated_widget_mac/ca_layer_tree_coordinator.mm

 // 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/accelerated_widget_mac/ca_layer_tree_coordinator.h"
 
 #include <AVFoundation/AVFoundation.h>
 
 #include "base/mac/mac_util.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 45 matching lines @@
 }
 
 CARendererLayerTree* CALayerTreeCoordinator::GetPendingCARendererLayerTree() {
   DCHECK(allow_remote_layers_);
   if (pending_gl_renderer_layer_tree_) {
     DLOG(ERROR) << "Either CALayer overlays or a backbuffer should be "
                    "specified, but not both.";
   }
   if (!pending_ca_renderer_layer_tree_)
     pending_ca_renderer_layer_tree_.reset(new CARendererLayerTree(
-        allow_av_sample_buffer_display_layer_, base::mac::IsAtLeastOS10_12()));
+        allow_av_sample_buffer_display_layer_, false));
   return pending_ca_renderer_layer_tree_.get();
 }
 
 void CALayerTreeCoordinator::CommitPendingTreesToCA(
     const gfx::Rect& pixel_damage_rect,
     bool* fullscreen_low_power_layer_valid) {
   *fullscreen_low_power_layer_valid = false;
 
   // Update the CALayer hierarchy.
   ScopedCAActionDisabler disabler;
@@ skipping 43 matching lines @@
 }
 
 IOSurfaceRef CALayerTreeCoordinator::GetIOSurfaceForDisplay() {
   DCHECK(!allow_remote_layers_);
   if (!current_gl_renderer_layer_tree_)
     return nullptr;
   return current_gl_renderer_layer_tree_->RootLayerIOSurface();
 }
 
 }  // namespace ui