Remove LoadSystemKeyboard()

ui/keyboard/content/keyboard_ui_content.h

 // Copyright 2015 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_CONTENT_KEYBOARD_UI_CONTENT_H_
 #define UI_KEYBOARD_CONTENT_KEYBOARD_UI_CONTENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 41 matching lines @@
   };
 
   explicit KeyboardUIContent(content::BrowserContext* context);
   ~KeyboardUIContent() override;
 
   // Requests the audio input from microphone for speech input.
   virtual void RequestAudioInput(content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) = 0;
 
-  // Loads system virtual keyboard. Noop if the current virtual keyboard is
-  // system virtual keyboard.
-  virtual void LoadSystemKeyboard();
-
   // Called when a window being observed changes bounds, to update its insets.
   void UpdateInsetsForWindow(aura::Window* window);
 
   // Overridden from KeyboardUI:
   aura::Window* GetKeyboardWindow() override;
   bool HasKeyboardWindow() const override;
   bool ShouldWindowOverscroll(aura::Window* window) const override;
   void ReloadKeyboardIfNeeded() override;
   void InitInsets(const gfx::Rect& new_bounds) override;
   void ResetInsets() override;
@@ skipping 50 matching lines @@
   std::unique_ptr<wm::Shadow> shadow_;
 
   std::unique_ptr<WindowBoundsChangeObserver> window_bounds_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardUIContent);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_CONTENT_KEYBOARD_UI_CONTENT_H_