Remove KEYBOARD_EXPORT.

ui/keyboard/keyboard_event_filter.h

 // Copyright 2017 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_EVENT_FILTER_H_
 #define UI_KEYBOARD_KEYBOARD_EVENT_FILTER_H_
 
 #include "base/macros.h"
 #include "ui/events/event_handler.h"
 #include "ui/keyboard/keyboard_export.h"
 
 namespace keyboard {
 
 // EventFilter for the keyboard window, which intercepts events before they are
 // processed by the keyboard window.
-class KEYBOARD_EXPORT KeyboardEventFilter : public ui::EventHandler {
+class  KeyboardEventFilter : public ui::EventHandler {
  public:
   KeyboardEventFilter() = default;
   ~KeyboardEventFilter() override = default;
 
   // ui::EventHandler overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(KeyboardEventFilter);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_EVENT_FILTER_H_