Remove the 2-level input method system & InputMethodBridge.

ui/base/ime/dummy_text_input_client.h

 // Copyright 2013 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_BASE_IME_DUMMY_TEXT_INPUT_CLIENT_H_
 #define UI_BASE_IME_DUMMY_TEXT_INPUT_CLIENT_H_
 
 #include "ui/base/ime/text_input_client.h"
 
 namespace ui {
 
 // Dummy implementation of TextInputClient. All functions do nothing.
 class DummyTextInputClient : public TextInputClient {
  public:
   DummyTextInputClient();
   explicit DummyTextInputClient(TextInputType text_input_type);
   ~DummyTextInputClient() override;
 
   // Overriden from TextInputClient.
   void SetCompositionText(const CompositionText& composition) override;
   void ConfirmCompositionText() override;
   void ClearCompositionText() override;
   void InsertText(const base::string16& text) override;
   void InsertChar(base::char16 ch, int flags) override;
-  gfx::NativeWindow GetAttachedWindow() const override;
   TextInputType GetTextInputType() const override;
   TextInputMode GetTextInputMode() const override;
   int GetTextInputFlags() const override;
   bool CanComposeInline() const override;
   gfx::Rect GetCaretBounds() const override;
   bool GetCompositionCharacterBounds(uint32 index,
                                      gfx::Rect* rect) const override;
   bool HasCompositionText() const override;
   bool GetTextRange(gfx::Range* range) const override;
   bool GetCompositionTextRange(gfx::Range* range) const override;
@@ skipping 11 matching lines @@
   void SetEditCommandForNextKeyEvent(int command_id) override;
 
   TextInputType text_input_type_;
 
   DISALLOW_COPY_AND_ASSIGN(DummyTextInputClient);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_DUMMY_TEXT_INPUT_CLIENT_H_