Completes crrev.com/23478020 and makes sure of detachment from IME.

ui/base/ime/input_method_tsf.cc

 // Copyright (c) 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.
 
 #include "ui/base/ime/input_method_tsf.h"
 
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/ime/win/tsf_bridge.h"
 #include "ui/base/ime/win/tsf_event_router.h"
 
@@ skipping 112 matching lines @@
     } else {
       // SetFocusedTextInputClient(NULL) must be interpreted as
       // "Remove the attached client".
       ui::TSFBridge::GetInstance()->RemoveFocusedClient(
           ui::TSFBridge::GetInstance()->GetFocusedTextInputClient());
     }
   }
   InputMethodWin::SetFocusedTextInputClient(client);
 }
 
+void InputMethodTSF::DetachTextInputClient(TextInputClient* client) {
+  InputMethodWin::DetachTextInputClient(client);
+  ui::TSFBridge::GetInstance()->RemoveFocusedClient(client);
+}
+
 bool InputMethodTSF::IsCandidatePopupOpen() const {
   return tsf_event_observer_->IsCandidatePopupOpen();
 }
 
 void InputMethodTSF::OnWillChangeFocusedClient(TextInputClient* focused_before,
                                                TextInputClient* focused) {
   if (IsWindowFocused(focused_before)) {
     ConfirmCompositionText();
     ui::TSFBridge::GetInstance()->RemoveFocusedClient(focused_before);
   }
@@ skipping 20 matching lines @@
   if (!IsTextInputTypeNone())
     ui::TSFBridge::GetInstance()->ConfirmComposition();
 }
 
 bool InputMethodTSF::IsWindowFocused(const TextInputClient* client) const {
   HWND attached_window_handle = GetAttachedWindowHandle(client);
   return attached_window_handle && GetFocus() == attached_window_handle;
 }
 
 }  // namespace ui