Coverity: Initialize member variables.

chrome/browser/extensions/extension_tts_api_win.cc

 // Copyright (c) 2011 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 169 matching lines @@
       char_position_ = static_cast<ULONG>(event.lParam) - prefix_len_;
       controller->OnTtsEvent(
           utterance_id_, TTS_EVENT_SENTENCE, char_position_,
           std::string());
       break;
     }
   }
 }
 
 ExtensionTtsPlatformImplWin::ExtensionTtsPlatformImplWin()
-  : speech_synthesizer_(NULL) {
+  : speech_synthesizer_(NULL),
+    utterance_id_(0),
+    prefix_len_(0),
+    stream_number_(0),
+    char_position_(0) {
   CoCreateInstance(
       CLSID_SpVoice,
       NULL,
       CLSCTX_SERVER,
       IID_ISpVoice,
       reinterpret_cast<void**>(&speech_synthesizer_));
   if (speech_synthesizer_) {
     ULONGLONG event_mask =
         SPFEI(SPEI_START_INPUT_STREAM) |
         SPFEI(SPEI_TTS_BOOKMARK) |
         SPFEI(SPEI_WORD_BOUNDARY) |
         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();
 }
 
 // static
 void ExtensionTtsPlatformImplWin::SpeechEventCallback(
     WPARAM w_param, LPARAM l_param) {
   GetInstance()->OnSpeechEvent();
 }