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

ui/aura/root_window_host_win.cc

Index: ui/aura/root_window_host_win.cc
diff --git a/ui/aura/root_window_host_win.cc b/ui/aura/root_window_host_win.cc
index a70c20479db0b6c25a6ba8b8ce2ce5417d42d94f..931c11e517964f378e229837a5700acf76d3d8b7 100644
--- a/ui/aura/root_window_host_win.cc
+++ b/ui/aura/root_window_host_win.cc
@@ -40,8 +40,7 @@ gfx::Size RootWindowHost::GetNativeScreenSize() {
 }
 
 RootWindowHostWin::RootWindowHostWin(const gfx::Rect& bounds)
-    : delegate_(NULL),
-      fullscreen_(false),
+    : fullscreen_(false),
       has_capture_(false),
       saved_window_style_(0),
       saved_window_ex_style_(0) {
@@ -55,10 +54,6 @@ RootWindowHostWin::~RootWindowHostWin() {
   DestroyWindow(hwnd());
 }
 
-void RootWindowHostWin::SetDelegate(RootWindowHostDelegate* delegate) {
-  delegate_ = delegate;
-}
-
 RootWindow* RootWindowHostWin::GetRootWindow() {
   return delegate_->AsRootWindow();
 }
@@ -222,10 +217,6 @@ void RootWindowHostWin::MoveCursorTo(const gfx::Point& location) {
   // Deliberately not implemented.
 }
 
-void RootWindowHostWin::SetFocusWhenShown(bool focus_when_shown) {
-  NOTIMPLEMENTED();
-}
-
 void RootWindowHostWin::PostNativeEvent(const base::NativeEvent& native_event) {
   ::PostMessage(
       hwnd(), native_event.message, native_event.wParam, native_event.lParam);