Do not consume Alt-Shift-Up event for IME switch.

chrome/browser/chromeos/input_method/mock_input_method_manager.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 "chrome/browser/chromeos/input_method/mock_input_method_manager.h"
 
 namespace chromeos {
 namespace input_method {
 
 MockInputMethodManager::MockInputMethodManager()
@@ skipping 101 matching lines @@
     std::vector<std::string>* ids) {
 }
 
 void MockInputMethodManager::SetInputMethodLoginDefault() {
 }
 
 void MockInputMethodManager::SetInputMethodLoginDefaultFromVPD(
     const std::string& locale, const std::string& layout) {
 }
 
-bool MockInputMethodManager::SwitchToNextInputMethod() {
-  return true;
+void MockInputMethodManager::SwitchToNextInputMethod() {
 }
 
 bool MockInputMethodManager::SwitchToPreviousInputMethod(
     const ui::Accelerator& accelerator) {
   return true;
 }
 
 bool MockInputMethodManager::SwitchInputMethod(
     const ui::Accelerator& accelerator) {
   return true;
@@ skipping 48 matching lines @@
   return true;
 }
 
 bool MockInputMethodManager::MigrateInputMethods(
     std::vector<std::string>* input_method_ids) {
   return false;
 }
 
 }  // namespace input_method
 }  // namespace chromeos