Delete layout_viewport_size.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 7152fcbb5f7bb94c98e6a163deeb4eef3d01d7d2..c9c21a8cc87de6334a6c093b65abd5da6130c842 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1365,16 +1365,13 @@ bool LayerTreeHostImpl::InitializeRenderer(
   return true;
 }
 
-void LayerTreeHostImpl::SetViewportSize(gfx::Size layout_viewport_size,
-                                        gfx::Size device_viewport_size) {
-  if (layout_viewport_size == layout_viewport_size_ &&
-      device_viewport_size == device_viewport_size_)
+void LayerTreeHostImpl::SetViewportSize(gfx::Size device_viewport_size) {
+  if (device_viewport_size == device_viewport_size_)
     return;
 
   if (pending_tree_ && device_viewport_size_ != device_viewport_size)
     active_tree_->SetViewportSizeInvalid();
 
-  layout_viewport_size_ = layout_viewport_size;
   device_viewport_size_ = device_viewport_size;
 
   UpdateMaxScrollOffset();