mash: Migrate tray IME view to wm common types, move to //ash/common

ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h

Index: ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h
diff --git a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h b/ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h
deleted file mode 100644
index 1739c4a9fe7c951865ccef8aefafaa0dd1b91b91..0000000000000000000000000000000000000000
--- a/ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef ASH_SYSTEM_CHROMEOS_VIRTUAL_KEYBOARD_VIRTUAL_KEYBOARD_OBSERVER_H_
-#define ASH_SYSTEM_CHROMEOS_VIRTUAL_KEYBOARD_VIRTUAL_KEYBOARD_OBSERVER_H_
-
-#include "ash/ash_export.h"
-
-class ASH_EXPORT VirtualKeyboardObserver {
- public:
-  virtual ~VirtualKeyboardObserver() {}
-
-  // Notifies when the keyboard is suppressed.
-  virtual void OnKeyboardSuppressionChanged(bool suppressed) = 0;
-};
-
-#endif  // ASH_SYSTEM_CHROMEOS_VIRTUAL_KEYBOARD_VIRTUAL_KEYBOARD_OBSERVER_H_