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

ui/aura/root_window_host_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/root_window_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 22 matching lines @@
   return new RootWindowHostWin(bounds);
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   return gfx::Size(GetSystemMetrics(SM_CXSCREEN),
                    GetSystemMetrics(SM_CYSCREEN));
 }
 
 RootWindowHostWin::RootWindowHostWin(const gfx::Rect& bounds)
-    : delegate_(NULL),
-      fullscreen_(false),
+    : fullscreen_(false),
       has_capture_(false),
       saved_window_style_(0),
       saved_window_ex_style_(0) {
   if (use_popup_as_root_window_for_test)
     set_window_style(WS_POPUP);
   Init(NULL, bounds);
   SetWindowText(hwnd(), L"aura::RootWindow!");
 }
 
 RootWindowHostWin::~RootWindowHostWin() {
   DestroyWindow(hwnd());
 }
 
-void RootWindowHostWin::SetDelegate(RootWindowHostDelegate* delegate) {
-  delegate_ = delegate;
-}
-
 RootWindow* RootWindowHostWin::GetRootWindow() {
   return delegate_->AsRootWindow();
 }
 
 gfx::AcceleratedWidget RootWindowHostWin::GetAcceleratedWidget() {
   return hwnd();
 }
 
 void RootWindowHostWin::Show() {
   ShowWindow(hwnd(), SW_SHOWNORMAL);
@@ skipping 143 matching lines @@
 }
 
 void RootWindowHostWin::OnCursorVisibilityChanged(bool show) {
   NOTIMPLEMENTED();
 }
 
 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);
 }
 
 void RootWindowHostWin::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   NOTIMPLEMENTED();
 }
 
@@ skipping 70 matching lines @@
 namespace test {
 
 // static
 void SetUsePopupAsRootWindowForTest(bool use) {
   use_popup_as_root_window_for_test = use;
 }
 
 }  // namespace test
 
 }  // namespace aura