Move Singleton and related structs to namespace base

chrome/browser/speech/tts_linux.cc

Index: chrome/browser/speech/tts_linux.cc
diff --git a/chrome/browser/speech/tts_linux.cc b/chrome/browser/speech/tts_linux.cc
index 05360b1868aa05a8b6df55abf60a3eea31d80321..ba15516ce03688052dd06e583bb99a34f5390b86 100644
--- a/chrome/browser/speech/tts_linux.cc
+++ b/chrome/browser/speech/tts_linux.cc
@@ -83,7 +83,7 @@ class TtsPlatformImplLinux : public TtsPlatformImpl {
   // uniquely identify a voice across all available modules.
   scoped_ptr<std::map<std::string, SPDChromeVoice> > all_native_voices_;
 
-  friend struct DefaultSingletonTraits<TtsPlatformImplLinux>;
+  friend struct base::DefaultSingletonTraits<TtsPlatformImplLinux>;
 
   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImplLinux);
 };
@@ -346,8 +346,9 @@ void TtsPlatformImplLinux::IndexMarkCallback(size_t msg_id,
 
 // static
 TtsPlatformImplLinux* TtsPlatformImplLinux::GetInstance() {
-  return Singleton<TtsPlatformImplLinux,
-                   LeakySingletonTraits<TtsPlatformImplLinux> >::get();
+  return base::Singleton<
+      TtsPlatformImplLinux,
+      base::LeakySingletonTraits<TtsPlatformImplLinux>>::get();
 }
 
 // static