Ash: Inline InitKeyboard, and make the caller of it call CreateKeyboard.

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 857e6e920b7ed49f0b1cdbbfe498338bfd039022..9f6bc2bb9abc27de2086001ef2f28382d07da93b 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -749,7 +749,7 @@ void RootWindowController::Init(RootWindowType root_window_type) {
   root_window_layout_manager_->OnWindowResized();
   if (root_window_type == RootWindowType::PRIMARY) {
     if (Shell::GetAshConfig() != Config::MASH)
-      shell->InitKeyboard();
+      shell->CreateKeyboard();
   } else {
     window_tree_host_->Show();