Make ExtensionTtsPlatformImplWin a leaky singleton to avoid a crash in the destructor.

chrome/browser/speech/extension_api/tts_extension_api_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/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 189 matching lines @@
         SPFEI(SPEI_SENTENCE_BOUNDARY) |
         SPFEI(SPEI_END_INPUT_STREAM);
     speech_synthesizer_->SetInterest(event_mask, event_mask);
     speech_synthesizer_->SetNotifyCallbackFunction(
         ExtensionTtsPlatformImplWin::SpeechEventCallback, 0, 0);
   }
 }
 
 // static
 ExtensionTtsPlatformImplWin* ExtensionTtsPlatformImplWin::GetInstance() {
-  return Singleton<ExtensionTtsPlatformImplWin>::get();
+  return Singleton<ExtensionTtsPlatformImplWin,
+                   LeakySingletonTraits<ExtensionTtsPlatformImplWin> >::get();
 }
 
 // static
 void ExtensionTtsPlatformImplWin::SpeechEventCallback(
     WPARAM w_param, LPARAM l_param) {
   GetInstance()->OnSpeechEvent();
 }