clang/win: Enable -Wswitch.

chrome/browser/speech/tts_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 <math.h>
 #include <sapi.h>
 
 #include "base/memory/singleton.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 202 matching lines @@
       controller->OnTtsEvent(
           utterance_id_, TTS_EVENT_WORD, char_position_,
           std::string());
       break;
     case SPEI_SENTENCE_BOUNDARY:
       char_position_ = static_cast<ULONG>(event.lParam) - prefix_len_;
       controller->OnTtsEvent(
           utterance_id_, TTS_EVENT_SENTENCE, char_position_,
           std::string());
       break;
+    default:
+      break;
     }
   }
 }
 
 TtsPlatformImplWin::TtsPlatformImplWin()
   : utterance_id_(0),
     prefix_len_(0),
     stream_number_(0),
     char_position_(0),
     paused_(false) {
@@ skipping 15 matching lines @@
 TtsPlatformImplWin* TtsPlatformImplWin::GetInstance() {
   return Singleton<TtsPlatformImplWin,
                    LeakySingletonTraits<TtsPlatformImplWin> >::get();
 }
 
 // static
 void TtsPlatformImplWin::SpeechEventCallback(
     WPARAM w_param, LPARAM l_param) {
   GetInstance()->OnSpeechEvent();
 }