Removing the use of base::Time inside the LayerTreeHost system.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 05bd81aa583b9f4c96261bbf4595795531dc7af8..ae3a4217c6507a35e881cbae55140d1f767a6e37 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -682,10 +682,6 @@ base::TimeTicks LayerTreeImpl::CurrentFrameTimeTicks() const {
   return layer_tree_host_impl_->CurrentFrameTimeTicks();
 }
 
-base::Time LayerTreeImpl::CurrentFrameTime() const {
-  return layer_tree_host_impl_->CurrentFrameTime();
-}
-
 base::TimeTicks LayerTreeImpl::CurrentPhysicalTimeTicks() const {
   return layer_tree_host_impl_->CurrentPhysicalTimeTicks();
 }