Simplify InputMethodWin initialization.

mandoline/ui/aura/input_method_mandoline.cc

 // Copyright (c) 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.
 
 #include "mandoline/ui/aura/input_method_mandoline.h"
 
 #include "ui/base/ime/text_input_client.h"
 #include "ui/events/event.h"
 
 namespace mandoline {
@@ skipping 48 matching lines @@
     const ui::TextInputClient* client) {
 }
 
 void InputMethodMandoline::OnInputLocaleChanged() {
 }
 
 std::string InputMethodMandoline::GetInputLocale() {
   return "";
 }
 
-bool InputMethodMandoline::IsActive() {
-  return true;
-}
-
 bool InputMethodMandoline::IsCandidatePopupOpen() const {
   return false;
 }
 
 }  // namespace mandoline