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

ui/aura/root_window_host_ozone.cc

Index: ui/aura/root_window_host_ozone.cc
diff --git a/ui/aura/root_window_host_ozone.cc b/ui/aura/root_window_host_ozone.cc
index 66cfdd5851679e8ced84a8500499269065314a6c..c6fd61505beaf53383d975f709936b043669a3b0 100644
--- a/ui/aura/root_window_host_ozone.cc
+++ b/ui/aura/root_window_host_ozone.cc
@@ -11,7 +11,8 @@
 namespace aura {
 
 RootWindowHostOzone::RootWindowHostOzone(const gfx::Rect& bounds)
-    : delegate_(NULL), widget_(0), bounds_(bounds) {
+    : widget_(0),
+      bounds_(bounds) {
   ui::OzonePlatform::Initialize();
   factory_.reset(ui::EventFactoryOzone::GetInstance());
   factory_->StartProcessingEvents();
@@ -43,10 +44,6 @@ bool RootWindowHostOzone::Dispatch(const base::NativeEvent& ne) {
   return true;
 }
 
-void RootWindowHostOzone::SetDelegate(RootWindowHostDelegate* delegate) {
-  delegate_ = delegate;
-}
-
 RootWindow* RootWindowHostOzone::GetRootWindow() {
   return delegate_->AsRootWindow();
 }
@@ -105,10 +102,6 @@ void RootWindowHostOzone::MoveCursorTo(const gfx::Point& location) {
   NOTIMPLEMENTED();
 }
 
-void RootWindowHostOzone::SetFocusWhenShown(bool focus_when_shown) {
-  NOTIMPLEMENTED();
-}
-
 void RootWindowHostOzone::PostNativeEvent(
     const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();