Support CancelCompositionText/ComfirmCompositionText in TSF

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"
 
 namespace ui {
@@ skipping 101 matching lines @@
     OnTextInputTypeChanged(focused);
 
     // Force to update caret bounds, in case the client thinks that the caret
     // bounds has not changed.
     OnCaretBoundsChanged(focused);
   }
 }
 
 void InputMethodTSF::ConfirmCompositionText() {
   if (!IsTextInputTypeNone()) {
-    // TSFBridge has not implemented ConfirmComposition yet. So here cancel
-    // the composition instead as a workaround.
-    // TODO(ime): Implement ConfirmComposition for TSF.
-    ui::TSFBridge::GetInstance()->CancelComposition();
+    ui::TSFBridge::GetInstance()->ConfirmComposition();
   }
 }
 
 bool InputMethodTSF::IsWindowFocused(const TextInputClient* client) const {
   if (!client)
     return false;
   HWND attached_window_handle = GetAttachedWindowHandle(client);
   return attached_window_handle && GetFocus() == attached_window_handle;
 }
 
 }  // namespace ui