Revert "Automatically trigger installation of high-quality speech synthesis extension."

chrome/browser/speech/tts_extension_loader_chromeos.h

+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
+#define CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
+
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+#include "extensions/browser/event_router.h"
+
+class Profile;
+
+// Profile-keyed class that loads a built-in TTS component extension
+// into a given profile on Chrome OS.
+class TtsExtensionLoaderChromeOs
+    : public BrowserContextKeyedService,
+      public extensions::EventRouter::Observer {
+ public:
+  static TtsExtensionLoaderChromeOs* GetInstance(Profile* profile);
+
+  // Returns true if the extension was not previously loaded and is now
+  // loading. This class will call
+  // ExtensionTtsController::RetrySpeakingQueuedUtterances when the
+  // extension finishes loading.
+  bool LoadTtsExtension();
+
+  // Implementation of BrowserContextKeyedService.
+  virtual void Shutdown() OVERRIDE;
+
+  // Implementation of extensions::EventRouter::Observer.
+  virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
+      OVERRIDE;
+
+ private:
+  // The state of TTS for this profile.
+  enum TtsState {
+    TTS_NOT_LOADED,
+    TTS_LOAD_REQUESTED,
+    TTS_LOADING,
+    TTS_LOADED
+  };
+
+  explicit TtsExtensionLoaderChromeOs(Profile* profile);
+  virtual ~TtsExtensionLoaderChromeOs() {}
+
+  bool IsTtsLoadedInThisProfile();
+
+  Profile* profile_;
+  TtsState tts_state_;
+
+  friend class TtsExtensionLoaderChromeOsFactory;
+
+  DISALLOW_COPY_AND_ASSIGN(TtsExtensionLoaderChromeOs);
+};
+
+#endif  // CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_