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

BUG=122026
TEST=Does not crash on shutdown on XP. Speech still stops if you load TTS Demo and exit in the middle of a long sentence.

Review URL: https://chromiumcodereview.appspot.com/10413054

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138393 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/speech/extension_api/tts_extension_api_platform.h

@@ -53,6 +53,9 @@ class ExtensionTtsPlatformImpl {
 
  protected:
   ExtensionTtsPlatformImpl() {}
+
+  // On some platforms this may be a leaky singleton - do not rely on the
+  // destructor being called!  http://crbug.com/122026
   virtual ~ExtensionTtsPlatformImpl() {}
 
   std::string error_;

chrome/browser/speech/extension_api/tts_extension_api_win.cc

@@ -207,7 +207,8 @@ ExtensionTtsPlatformImplWin::ExtensionTtsPlatformImplWin()
 
 // static
 ExtensionTtsPlatformImplWin* ExtensionTtsPlatformImplWin::GetInstance() {
-  return Singleton<ExtensionTtsPlatformImplWin>::get();
+  return Singleton<ExtensionTtsPlatformImplWin,
+                   LeakySingletonTraits<ExtensionTtsPlatformImplWin> >::get();
 }
 
 // static