Move TTS extension API to chrome/browser/speech/

chrome/browser/extensions/extension_tts_api_linux.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 "base/memory/singleton.h"
-#include "chrome/browser/extensions/extension_tts_api_platform.h"
-
-namespace {
-const char kNotSupportedError[] =
-    "Native speech synthesis not supported on this platform.";
-};
-
-class ExtensionTtsPlatformImplLinux : public ExtensionTtsPlatformImpl {
- public:
-  virtual bool PlatformImplAvailable() {
-    return false;
-  }
-
-  virtual bool Speak(
-      int utterance_id,
-      const std::string& utterance,
-      const std::string& lang,
-      const UtteranceContinuousParameters& params) {
-    error_ = kNotSupportedError;
-    return false;
-  }
-
-  virtual bool StopSpeaking() {
-    error_ = kNotSupportedError;
-    return false;
-  }
-
-  virtual bool IsSpeaking() {
-    error_ = kNotSupportedError;
-    return false;
-  }
-
-  virtual bool SendsEvent(TtsEventType event_type) {
-    return false;
-  }
-
-  // Get the single instance of this class.
-  static ExtensionTtsPlatformImplLinux* GetInstance() {
-    return Singleton<ExtensionTtsPlatformImplLinux>::get();
-  }
-
- private:
-  ExtensionTtsPlatformImplLinux() {}
-  virtual ~ExtensionTtsPlatformImplLinux() {}
-
-  friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplLinux>;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplLinux);
-};
-
-// static
-ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
-  return ExtensionTtsPlatformImplLinux::GetInstance();
-}