Remove KEYBOARD_EXPORT.

ui/keyboard/keyboard_layout_delegate.h

 // 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.
 
 #ifndef UI_KEYBOARD_KEYBOARD_LAYOUT_DELEGATE_H_
 #define UI_KEYBOARD_KEYBOARD_LAYOUT_DELEGATE_H_
 
 #include <stdint.h>
 
 #include "ui/keyboard/keyboard_export.h"
 
 namespace keyboard {
 
 // A delegate class to control the virtual keyboard layout
-class KEYBOARD_EXPORT KeyboardLayoutDelegate {
+class  KeyboardLayoutDelegate {
  public:
   virtual ~KeyboardLayoutDelegate() {}
 
   virtual void MoveKeyboardToDisplay(int64_t display_id) = 0;
 
   // Move the keyboard to the touchable display which has the input focus, or
   // the first touchable display.
   virtual void MoveKeyboardToTouchableDisplay() = 0;
 };
 
 }  // namespace keyboard
 
 #endif