Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

ui/aura/remote_root_window_host_win.cc

Index: ui/aura/remote_root_window_host_win.cc
diff --git a/ui/aura/remote_root_window_host_win.cc b/ui/aura/remote_root_window_host_win.cc
index 326f9cffbb0c167f52fd012b95eccae04b24876c..d88b56893beb3b011d885d33cc430d408be4147c 100644
--- a/ui/aura/remote_root_window_host_win.cc
+++ b/ui/aura/remote_root_window_host_win.cc
@@ -299,10 +299,6 @@ Window* RemoteRootWindowHostWin::GetAshWindow() {
   return GetRootWindow()->window();
 }
 
-void RemoteRootWindowHostWin::SetDelegate(RootWindowHostDelegate* delegate) {
-  delegate_ = delegate;
-}
-
 RootWindow* RemoteRootWindowHostWin::GetRootWindow() {
   return delegate_->AsRootWindow();
 }
@@ -407,10 +403,6 @@ void RemoteRootWindowHostWin::MoveCursorTo(const gfx::Point& location) {
   host_->Send(new MetroViewerHostMsg_SetCursorPos(location.x(), location.y()));
 }
 
-void RemoteRootWindowHostWin::SetFocusWhenShown(bool focus_when_shown) {
-  NOTIMPLEMENTED();
-}
-
 void RemoteRootWindowHostWin::PostNativeEvent(
     const base::NativeEvent& native_event) {
 }