ash: Move VirtualKeyboardStateObserver functionality to ShellObserver

chrome/browser/ui/ash/chrome_shell_delegate.h

Index: chrome/browser/ui/ash/chrome_shell_delegate.h
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.h b/chrome/browser/ui/ash/chrome_shell_delegate.h
index b70ea6f0dc9a44a3b3b30695258848ad1f5c9c25..5d3c6dbef96f2af090f9cfeab4360a7078790fb1 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.h
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.h
@@ -10,7 +10,6 @@
 
 #include "ash/common/shell_delegate.h"
 #include "base/macros.h"
-#include "base/observer_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/ash/metrics/chrome_user_metrics_recorder.h"
 #include "content/public/browser/notification_observer.h"
@@ -43,11 +42,6 @@ class ChromeShellDelegate : public ash::ShellDelegate,
   void PreShutdown() override;
   void Exit() override;
   keyboard::KeyboardUI* CreateKeyboardUI() override;
-  void VirtualKeyboardActivated(bool activated) override;
-  void AddVirtualKeyboardStateObserver(
-      ash::VirtualKeyboardStateObserver* observer) override;
-  void RemoveVirtualKeyboardStateObserver(
-      ash::VirtualKeyboardStateObserver* observer) override;
   void OpenUrl(const GURL& url) override;
   app_list::AppListPresenter* GetAppListPresenter() override;
   ash::ShelfDelegate* CreateShelfDelegate(ash::ShelfModel* model) override;
@@ -80,9 +74,6 @@ class ChromeShellDelegate : public ash::ShellDelegate,
 
   ChromeLauncherControllerImpl* shelf_delegate_;
 
-  base::ObserverList<ash::VirtualKeyboardStateObserver>
-      keyboard_state_observer_list_;
-
   // Proxies events from chrome/browser to ash::UserMetricsRecorder.
   std::unique_ptr<ChromeUserMetricsRecorder> chrome_user_metrics_recorder_;