Revert of Added a system caret used for accessibility on Windows.

ui/base/ime/input_method_win.cc

 // Copyright (c) 2012 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.
 
 #include "ui/base/ime/input_method_win.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <cwctype>
 
@@ skipping 212 matching lines @@
 void InputMethodWin::OnTextInputTypeChanged(const TextInputClient* client) {
   if (!IsTextInputClientFocused(client) || !IsWindowFocused(client))
     return;
   imm32_manager_.CancelIME(toplevel_window_handle_);
   UpdateIMEState();
 }
 
 void InputMethodWin::OnCaretBoundsChanged(const TextInputClient* client) {
   if (!IsTextInputClientFocused(client) || !IsWindowFocused(client))
     return;
-  NotifyTextInputCaretBoundsChanged(client);
   TextInputType text_input_type = GetTextInputType();
   if (client == GetTextInputClient() &&
       text_input_type != TEXT_INPUT_TYPE_NONE &&
       text_input_type != TEXT_INPUT_TYPE_PASSWORD && GetEngine()) {
     // |enabled_| == false could be faked, and the engine should rely on the
     // real type from GetTextInputType().
     GetEngine()->SetCompositionBounds(GetCompositionBounds(client));
   }
   if (!enabled_)
     return;
@@ skipping 515 matching lines @@
   ui::IMEEngineHandlerInterface* engine = GetEngine();
   if (engine) {
     if (old_text_input_type != ui::TEXT_INPUT_TYPE_NONE)
       engine->FocusOut();
     if (GetTextInputType() != ui::TEXT_INPUT_TYPE_NONE)
       engine->FocusIn(context);
   }
 }
 
 }  // namespace ui