Mac color: Apply Sierra workaround unconditionally

This was accidentally enabled on just <10.12. It didn't cause any
issues, so expand to 10.12.

BUG=633805

Review-Url: https://codereview.chromium.org/2405883002
Cr-Commit-Position: refs/heads/master@{#424190}
(cherry picked from commit 139c0a4a023d168763f0983bebe2790b38419bb2)

Review URL: https://codereview.chromium.org/2412123002 .

Cr-Commit-Position: refs/branch-heads/2883@{#60}
Cr-Branched-From: 614d31daee2f61b0180df403a8ad43f20b9f6dd7-refs/heads/master@{#423768}
diff --git a/ui/accelerated_widget_mac/ca_layer_tree_coordinator.mm b/ui/accelerated_widget_mac/ca_layer_tree_coordinator.mm
index 05d85c5..187983c 100644
--- a/ui/accelerated_widget_mac/ca_layer_tree_coordinator.mm
+++ b/ui/accelerated_widget_mac/ca_layer_tree_coordinator.mm
@@ -63,7 +63,7 @@
   }
   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();
 }