Remove SetHostSize/Bounds from RootWindow in favor of just calling SetBounds() on host()

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index e7bef65b5d7f2475207facd98f8795dd5a124fad..a6cff54326ad0bfd0f1eff137cdc9c23c71d525e 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -616,7 +616,7 @@ void DisplayController::OnDisplayBoundsChanged(const gfx::Display& display) {
   DCHECK(!display_info.bounds_in_native().IsEmpty());
   aura::WindowEventDispatcher* dispatcher =
       root_windows_[display.id()]->GetDispatcher();
-  dispatcher->SetHostBounds(display_info.bounds_in_native());
+  dispatcher->host()->SetBounds(display_info.bounds_in_native());
   SetDisplayPropertiesOnHostWindow(dispatcher, display);
 }
 
@@ -632,7 +632,7 @@ void DisplayController::OnDisplayAdded(const gfx::Display& display) {
         GetDisplayManager()->GetDisplayInfo(display.id());
     aura::WindowEventDispatcher* dispatcher =
         root_windows_[display.id()]->GetDispatcher();
-    dispatcher->SetHostBounds(display_info.bounds_in_native());
+    dispatcher->host()->SetBounds(display_info.bounds_in_native());
     SetDisplayPropertiesOnHostWindow(dispatcher, display);
   } else {
     if (primary_display_id == gfx::Display::kInvalidDisplayID)