CC Animation: Erase cc::LayerSettings everywhere.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 43bcbe969823298a8431e10003c787f712a9fb7c..fcc856fd1e0162fd87a7d1ed82fd21b53e973aa0 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -111,7 +111,6 @@ class LayerTreeHostImplTest : public testing::Test,
     settings.minimum_occlusion_tracking_size = gfx::Size();
     settings.renderer_settings.texture_id_allocation_chunk_size = 1;
     settings.gpu_rasterization_enabled = true;
-    settings.use_compositor_animation_timelines = true;
     return settings;
   }
 
@@ -509,9 +508,7 @@ class LayerTreeHostImplTest : public testing::Test,
 class LayerTreeHostImplTimelinesTest : public LayerTreeHostImplTest {
  public:
   void SetUp() override {
-    LayerTreeSettings settings = DefaultSettings();
-    settings.use_compositor_animation_timelines = true;
-    CreateHostImpl(settings, CreateOutputSurface());
+    CreateHostImpl(DefaultSettings(), CreateOutputSurface());
   }
 };