Revert of Start of display management for mus

components/mus/ws/window_tree_host_impl.cc

Index: components/mus/ws/window_tree_host_impl.cc
diff --git a/components/mus/ws/window_tree_host_impl.cc b/components/mus/ws/window_tree_host_impl.cc
index 8aa8f6a2cf3588f151f04448b4e7207fcd933655..ef92138123e19ddf399a9b0ba0d6972a8551e4c7 100644
--- a/components/mus/ws/window_tree_host_impl.cc
+++ b/components/mus/ws/window_tree_host_impl.cc
@@ -50,8 +50,6 @@
   // For mouse moves, the new event just replaces the old event.
   return second;
 }
-
-uint32_t next_id = 1;
 
 }  // namespace
 
@@ -100,8 +98,7 @@
           DisplayManager::Create(app_impl, gpu_state, surfaces_state)),
       window_manager_(std::move(window_manager)),
       tree_awaiting_input_ack_(nullptr),
-      last_cursor_(0),
-      id_(next_id) {
+      last_cursor_(0) {
   display_manager_->Init(this);
   if (client_) {
     client_.set_connection_error_handler(base::Bind(
@@ -156,10 +153,6 @@
 
 const mojom::ViewportMetrics& WindowTreeHostImpl::GetViewportMetrics() const {
   return display_manager_->GetViewportMetrics();
-}
-
-mojom::Rotation WindowTreeHostImpl::GetRotation() const {
-  return display_manager_->GetRotation();
 }
 
 void WindowTreeHostImpl::SetFocusedWindow(ServerWindow* new_focused_window) {