Remove the dependency of Extension API from tts_chromeos

chrome/browser/speech/tts_controller_impl.cc

 // Copyright 2014 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 "chrome/browser/speech/tts_controller_impl.h"
 
 #include <string>
 #include <vector>
 
 #include "base/float_util.h"
@@ skipping 444 matching lines @@
 
 void TtsControllerImpl::RemoveVoicesChangedDelegate(
     VoicesChangedDelegate* delegate) {
   voices_changed_delegates_.erase(delegate);
 }
 
 void TtsControllerImpl::SetTtsEngineDelegate(
     TtsEngineDelegate* delegate) {
   tts_engine_delegate_ = delegate;
 }
+
+TtsEngineDelegate* TtsControllerImpl::GetTtsEngineDelegate() {
+  return tts_engine_delegate_;
+}