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

ash/display/screen_position_controller_unittest.cc

Index: ash/display/screen_position_controller_unittest.cc
diff --git a/ash/display/screen_position_controller_unittest.cc b/ash/display/screen_position_controller_unittest.cc
index f3b8d655c35277aee553f7afe56cefacea558983..a9996c25eb00c571c505633891990b2f88facc1e 100644
--- a/ash/display/screen_position_controller_unittest.cc
+++ b/ash/display/screen_position_controller_unittest.cc
@@ -89,14 +89,14 @@ TEST_F(ScreenPositionControllerTest, MAYBE_ConvertHostPointToScreen) {
 
   aura::Window::Windows root_windows =
       Shell::GetInstance()->GetAllRootWindows();
-  EXPECT_EQ("100,100",
-            root_windows[0]->GetDispatcher()->GetHostOrigin().ToString());
-  EXPECT_EQ("200x200",
-            root_windows[0]->GetDispatcher()->GetHostSize().ToString());
-  EXPECT_EQ("100,500",
-            root_windows[1]->GetDispatcher()->GetHostOrigin().ToString());
-  EXPECT_EQ("200x200",
-            root_windows[1]->GetDispatcher()->GetHostSize().ToString());
+  EXPECT_EQ("100,100", root_windows[0]->GetDispatcher()->host()->
+      GetBounds().origin().ToString());
+  EXPECT_EQ("200x200", root_windows[0]->GetDispatcher()->host()->
+      GetBounds().size().ToString());
+  EXPECT_EQ("100,500", root_windows[1]->GetDispatcher()->host()->
+      GetBounds().origin().ToString());
+  EXPECT_EQ("200x200", root_windows[1]->GetDispatcher()->host()->
+      GetBounds().size().ToString());
 
   const gfx::Point window_pos(100, 100);
   window_->SetBoundsInScreen(
@@ -178,13 +178,17 @@ TEST_F(ScreenPositionControllerTest, MAYBE_ConvertHostPointToScreenHiDPI) {
   aura::Window::Windows root_windows =
       Shell::GetInstance()->GetAllRootWindows();
   EXPECT_EQ("100,100",
-            root_windows[0]->GetDispatcher()->GetHostOrigin().ToString());
+            root_windows[0]->GetDispatcher()->host()->
+                GetBounds().origin().ToString());
   EXPECT_EQ("200x200",
-            root_windows[0]->GetDispatcher()->GetHostSize().ToString());
+            root_windows[0]->GetDispatcher()->host()->
+                GetBounds().size().ToString());
   EXPECT_EQ("100,500",
-            root_windows[1]->GetDispatcher()->GetHostOrigin().ToString());
+            root_windows[1]->GetDispatcher()->host()->
+                GetBounds().origin().ToString());
   EXPECT_EQ("200x200",
-            root_windows[1]->GetDispatcher()->GetHostSize().ToString());
+            root_windows[1]->GetDispatcher()->host()->
+                GetBounds().size().ToString());
 
   // Put |window_| to the primary 2x display.
   window_->SetBoundsInScreen(gfx::Rect(20, 20, 50, 50),