ash: Move VirtualKeyboardStateObserver functionality to ShellObserver

ash/sysui/shell_delegate_mus.cc

 // Copyright 2016 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 "ash/sysui/shell_delegate_mus.h"
 
 #include "ash/common/default_accessibility_delegate.h"
 #include "ash/common/media_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
@@ skipping 136 matching lines @@
 
 void ShellDelegateMus::Exit() {
   NOTIMPLEMENTED();
 }
 
 keyboard::KeyboardUI* ShellDelegateMus::CreateKeyboardUI() {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
-void ShellDelegateMus::VirtualKeyboardActivated(bool activated) {
-  NOTIMPLEMENTED();
-}
-
-void ShellDelegateMus::AddVirtualKeyboardStateObserver(
-    VirtualKeyboardStateObserver* observer) {
-  NOTIMPLEMENTED();
-}
-
-void ShellDelegateMus::RemoveVirtualKeyboardStateObserver(
-    VirtualKeyboardStateObserver* observer) {
-  NOTIMPLEMENTED();
-}
-
 void ShellDelegateMus::OpenUrl(const GURL& url) {
   NOTIMPLEMENTED();
 }
 
 app_list::AppListPresenter* ShellDelegateMus::GetAppListPresenter() {
   return app_list_presenter_.get();
 }
 
 ShelfDelegate* ShellDelegateMus::CreateShelfDelegate(ShelfModel* model) {
   return new ShelfDelegateMus(model);
@@ skipping 48 matching lines @@
   return base::string16();
 }
 
 gfx::Image ShellDelegateMus::GetDeprecatedAcceleratorImage() const {
   NOTIMPLEMENTED();
   return gfx::Image();
 }
 
 }  // namespace sysui
 }  // namespace ash